全部評(píng)論(3條)
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- 偶爾寂寞呀 2015-05-11 00:00:00
- 關(guān)于這個(gè) 你可以在億谷教育螢窗在線里去問(wèn)那邊的老師,一定會(huì)有答案的
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- 519540585qq 2016-06-22 00:00:00
- 1、帶來(lái)的環(huán)境問(wèn)題:稀土開(kāi)采不當(dāng),有可能造成植被破壞、水土流失等生態(tài)問(wèn)題,提煉加工不當(dāng)還會(huì)造成大氣污染、水污染、固體廢棄物污染,給當(dāng)?shù)鼐用裆a(chǎn)生活造成不良影響。國(guó)內(nèi)稀土企業(yè)污染處理方面能力明顯不足,偷排亂排、隨處堆砌的現(xiàn)象屢見(jiàn)不鮮,尤其是中小企業(yè)將稀土污染問(wèn)題束之高閣,嚴(yán)重破壞了當(dāng)?shù)厣鷳B(tài)環(huán)境。 2、治理措施:首先,應(yīng)該建立標(biāo)準(zhǔn)制度,建議規(guī)定我國(guó)稀土生產(chǎn)企業(yè),建立環(huán)境整治、開(kāi)采、生產(chǎn)等方面環(huán)境內(nèi)控制度。其次,開(kāi)征稀土環(huán)境稅,緩解地方治理成本壓力。加快推進(jìn)環(huán)境保護(hù)稅出臺(tái),建議由ZY和地方按照固定比例分享,并突出地方政府的環(huán)境治理責(zé)任。此外,由ZY財(cái)政安排稀土污染環(huán)境治理專(zhuān)項(xiàng)資金,依據(jù)產(chǎn)區(qū)稀土開(kāi)采和冶煉規(guī)模、污染治理投入需求、治理進(jìn)度等情況,落實(shí)資金分配情況。
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- 不盡力不安心 2018-08-04 00:00:00
- (1)河流流量季節(jié)變化大,無(wú)結(jié)冰期,落差大,水能資源豐富 (2)大牧場(chǎng)放牧業(yè) 地廣人稀,租金低;氣候溫暖,草類(lèi)茂盛;距海港近,交通便利 (3)分布于河流沿岸 ;分布于河口地帶;分布于鐵路沿線 (4)以平原、山地為主;地勢(shì)南高北低;
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- 地理大題,在線等
2015-05-10 13:32:12
371
3
- 英文翻譯,在線等!!!
- AnemailwithanAccountActivationLinkhasbeensenttotheemailaddressyou'veprovided.Ifyoucan'tfindtheemailinyourinbox,pleasecheckyour"Spam"folderassomeemailfilterswillmistakenly... An email with an Account Activation Link has been sent to the email address you've provided. If you can't find the email in your inbox, please check your "Spam" folder as some email filters will mistakenly redirect this automatically generated message to that folder. Click on the link in the email to automatically activate your account and you'll be on your way! 展開(kāi)
2007-09-07 03:19:11
691
5
- IPC$是什么(在線等)
- 快呀
2009-07-25 12:11:39
314
1
- 英語(yǔ)翻譯,急急?。≡诰€等
- 光譜分析儀,拉力試驗(yàn)機(jī),動(dòng)平衡試驗(yàn)機(jī),金相顯微鏡,碳硫分析儀,沖天爐,地砂線,精密數(shù)控車(chē)床,精密數(shù)控磨床。翻譯成英語(yǔ)啊。在線等。非常急。非常感謝
2008-10-28 05:27:04
582
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- 成績(jī)單翻譯 在線等
- 生物工藝實(shí)驗(yàn)1《分子生物學(xué)》課程論文《生物工藝學(xué)》教學(xué)實(shí)習(xí)基因工程原理生物工藝學(xué)1《微生物遺傳學(xué)》課程論文生物工程綜合教學(xué)實(shí)習(xí)生物工藝實(shí)驗(yàn)2生物反應(yīng)器生物工藝學(xué)2生物工程綜合... 生物工藝實(shí)驗(yàn)1 《分子生物學(xué)》課程論文 《生物工藝學(xué)》教學(xué)實(shí)習(xí) 基因工程原理 生物工藝學(xué)1 《微生物遺傳學(xué)》課程論文 生物工程綜合教學(xué)實(shí)習(xí) 生物工藝實(shí)驗(yàn)2 生物反應(yīng)器 生物工藝學(xué)2 生物工程綜合專(zhuān)業(yè)實(shí)踐 《生物反應(yīng)器》課程設(shè)計(jì) 生物工程實(shí)習(xí)模塊2 展開(kāi)
2008-01-21 13:56:55
498
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- 初三化學(xué),急,在線等!
- 為什么在初中的過(guò)濾實(shí)驗(yàn)中,過(guò)濾時(shí),漏斗下端管口要緊貼燒杯內(nèi)壁?漏斗中液面為什么應(yīng)低于濾紙邊緣?經(jīng)過(guò)濾的液體,仍然渾濁的原因是?進(jìn)一步處理的方法?... 為什么在初中的過(guò)濾實(shí)驗(yàn)中,過(guò)濾時(shí),漏斗下端管口要緊貼燒杯內(nèi)壁? 漏斗中液面為什么應(yīng)低于濾紙邊緣? 經(jīng)過(guò)濾的液體,仍然渾濁的原因是 ? 進(jìn)一步處理的方法? 展開(kāi)
2012-04-12 02:33:01
666
6
- 求地理的一些常用的地理名詞 和意思,如土地鹽堿化,春汛等
- 考試常提到的... 考試常提到的 展開(kāi)
2011-07-03 00:54:31
488
1
- 氨基酸是不是分子,在線等
2018-12-04 18:29:09
393
0
- 高中生物實(shí)驗(yàn)題,在線等??!
- 1、馬鈴薯塊莖如經(jīng)日曬,表面可變成綠色,這一現(xiàn)象是由于:A白色體轉(zhuǎn)變?yōu)槿~綠體;B白色體轉(zhuǎn)變?yōu)橛猩w;C葉綠體轉(zhuǎn)變?yōu)橛猩w;D質(zhì)體轉(zhuǎn)變?yōu)橛猩w。完全不明白。。2、下列處理不能加快... 1、馬鈴薯塊莖如經(jīng)日曬,表面可變成綠色,這一現(xiàn)象是由于:A白色體轉(zhuǎn)變?yōu)槿~綠體;B白色體轉(zhuǎn)變?yōu)橛猩w;C葉綠體轉(zhuǎn)變?yōu)橛猩w;D質(zhì)體轉(zhuǎn)變?yōu)橛猩w。完全不明白。。 2、下列處理不能加快細(xì)胞質(zhì)流動(dòng)的是:A放溫水中;B燈光照射;C切割實(shí)驗(yàn)材料;D加2,4-二硝基苯酚YZ細(xì)胞呼吸作用。關(guān)鍵在C和D,都是什么意思? 3、某同學(xué)在顯微鏡下觀察自制的洋蔥根尖有絲分裂臨時(shí)裝片,發(fā)現(xiàn)細(xì)胞重疊嚴(yán)重,從制作裝片過(guò)程分析,Z早可能出現(xiàn)的問(wèn)題是:A載玻片上沒(méi)滴清水;B解離的時(shí)間不夠;C沒(méi)有將根尖壓碎;D取材不好。為什么是B不是D? 4、下列哪種物質(zhì)單位質(zhì)量的含糖量Z多:脫脂棉,蘋(píng)果,面粉,鮮牛肉。脫脂棉是什么。。比蘋(píng)果還多。。 5、將面團(tuán)包在紗布中在清水中搓洗,粘留在紗布上的黏稠物質(zhì)和洗出的白漿分別都是什么? 多謝?。。≡诰€等! 展開(kāi)
2012-01-30 16:47:35
385
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- 大學(xué)有機(jī)化學(xué) 在線等急
2018-08-01 09:09:38
405
1
- 初一 地理
- 馬上就要期末考試了,可我對(duì)地理還是一竅不通 求高人幫我做一個(gè)初一上的地理的知識(shí)歸納總結(jié) 好讓我學(xué)好地理(那種看了一目了然的Z好) 謝謝
2011-12-16 03:35:08
527
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- 光電傳感器問(wèn)題,調(diào)試靈敏度。在線等
- 這個(gè)是新的,請(qǐng)問(wèn)這個(gè)靈敏度要怎么調(diào)節(jié),包裝機(jī)理料線上用的,萬(wàn)分感謝
2015-04-13 04:12:36
621
1
- 擠出機(jī)英語(yǔ)翻譯。。。在線等。高分懸賞
- Simplified Flow Theory for Screw Extruders The flow behavior of a viscous liquid in the channel of an extruder screw is shown to be similar to the flow behavior of viscous liquids between infinite parallel plates, one of which is station... Simplified Flow Theory for Screw Extruders The flow behavior of a viscous liquid in the channel of an extruder screw is shown to be similar to the flow behavior of viscous liquids between infinite parallel plates, one of which is stationary and the other moving. Assuming Newtonian behavior of the liquid, a differential equation was derived which relates the rate of extrusion and the die pressure to the screw and die geometry and to the operating variables. Integrated flow equations are given for the special case in which the viscosity of the liquid is constant throughout the screw channel (isothermal extrusion). Equations are also given for the case in which the dimensions of the screw channel are functions of their position along the length of the screw. IN THE preceding paper ( 1 )o f this symposium the literature pertaining to the problem of viscous flow in extruders was reviewed. In this paper the development of simplified but more useful flow equations is presented. The synibols and nomenclature used in this paper are defined in the preceding paper (1). The flow mechanism of the viscous liquid in the helical channel of the screw can be better understood if one imagines that the channel be unrolled and laid out on a flat surface. Figure 1 shows this concept of the screw channel. If the lower plate, representing the screw surface, is held stationary and the upper plate, representing the barrel surface, is moved in the direction of the arrow, the relative motions will be the same as those existing in an extruder where the barrel is stationary and the screw rotates. Assuming that the liquid wets both surfaces, the motion of the barrel drags the viscous liquid along with it, while the stationary plate exerts an equal and opposite drag. The velocity of the liquid, relative to the screw, is a maximum at the barrel surface and zero at the screw surface. There is also a directional factor involved, since the channel is inclined at angle p to the direction of motion. Therefore, in computing the flow rate in the channel we break up the velocity into two components: one of these acts directly down the channel, and the other acts at right angles to it. We call the component which acts down the channel drag velocity, and the component which acts at right angles to this transverse velocity. At the end of the channel there is generally a die or some other restriction to flow. This sets up a pressure gradient down the channel causing a flow in the reverse direction to the drag flon. There is one other flow that must be considered. Generally the screw does not fit perfectly inside the barrel. In other words, there is a clearance between the top of the screw threads and the barrel surface. 展開(kāi)
2009-03-29 12:37:44
653
2
- 量杯怎么能量面粉 在線等
- 買(mǎi)錯(cuò)了 買(mǎi)了10個(gè)有刻度的量杯 1/4tsp1.25ml 1/2tsp2.5毫升 請(qǐng)問(wèn) 這個(gè)可以量面粉么 12.5G面粉大概裝哪個(gè)里面 多少杯?、 請(qǐng)?jiān)敿?xì) 在線等
2011-03-01 00:55:11
600
2
- 化學(xué)論文 初中 (在線等答案)
- 關(guān)于三聚氰胺的話(huà)題。(奶粉那事) 只要300字左右。 給我個(gè)文章結(jié)構(gòu)就好了,內(nèi)容我自己寫(xiě)。 (我從來(lái)沒(méi)寫(xiě)過(guò)論文)
2009-02-14 22:17:54
575
1
- 菊花的組織培養(yǎng),急用,在線等
- 急用,需要關(guān)于促進(jìn)菊花利于出芽,愈傷組織和生根的三種培養(yǎng)基配方... 急用,需要關(guān)于促進(jìn)菊花利于出芽,愈傷組織和生根的三種培養(yǎng)基配方 展開(kāi)
2016-01-31 17:14:44
336
1
- 求lightcycler480數(shù)據(jù)分析軟件,急,在線等!
2015-08-21 05:51:35
315
2
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