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- 求關(guān)于水面的環(huán)境描寫,急……
2018-12-02 14:16:37
344
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- 急求!關(guān)于紅外線檢測儀
- 我們學(xué)校說要在校門口安個紅外線電子檢測儀,用來檢測看我們進校門的時候有沒有帶手機,還有mp4等電子產(chǎn)品.我想問下真的有這種檢測儀么?有的話這個檢測儀有什么性能能?手機在關(guān)機或者將電板拿掉的情況下那個東西也能檢測到么?mp4關(guān)機后能檢測到么?這個東西... 我們學(xué)校說要在校門口安個紅外線電子檢測儀,用來檢測看我們進校門的時候有沒有帶手機,還有mp4等電子產(chǎn)品.我想問下真的有這種檢測儀么?有的話這個檢測儀有什么性能能?手機在關(guān)機或者將電板拿掉的情況下那個東西也能檢測到么?mp4關(guān)機后能檢測到么?這個東西大概是什么原理? 展開
2008-09-05 18:44:00
473
1
- 什么是TOD 關(guān)于環(huán)境方面的
2007-11-12 16:59:36
485
2
- 急求關(guān)于三聚氰胺事件的案例分析?。?! 管理學(xué)科方面的
- 答案和案例都要謝謝各位大俠
2011-01-07 06:45:13
522
1
- 有沒有關(guān)于污水描寫的文章
2006-03-28 16:21:21
461
2
- 急求一篇關(guān)于超聲波傳感器的畢業(yè)論文
- 求一篇關(guān)于超聲波傳感器的畢業(yè)論文 論文內(nèi)容不要是它的發(fā)展前景或廣泛應(yīng)用 Z好細致到某一樣用途 例如利用單片機的超聲波測液位 不用寫的太細致幾千字的 寫個細致的提綱就行或?qū)憘€大概需要找資料寫個名字我自己找 懸賞分數(shù)雖不高 但能幫我搞定這個難題 全部分... 求一篇關(guān)于超聲波傳感器的畢業(yè)論文 論文內(nèi)容不要是它的發(fā)展前景或廣泛應(yīng)用 Z好細致到某一樣用途 例如利用單片機的超聲波測液位 不用寫的太細致幾千字的 寫個細致的提綱就行或?qū)憘€大概需要找資料寫個名字我自己找 懸賞分數(shù)雖不高 但能幫我搞定這個難題 全部分數(shù)300奉上 急求 謝謝 展開
2010-03-25 18:53:53
685
3
- 急求關(guān)于服裝類的外文參考文獻
- 急需關(guān)于服裝類的外文參考文獻,哪位高人請幫忙~~~~要3-6篇... 急需關(guān)于服裝類的外文參考文獻,哪位高人請幫忙~~~~ 要3-6篇 展開
2018-11-20 03:55:58
258
0
- 求幾本關(guān)于建筑測量方面的書籍
- 比如如何使用全站儀,放線標(biāo)準,如何計算測量坐標(biāo)
2012-09-16 06:47:20
437
2
- 關(guān)于鍋爐爐水磷酸根突然消失,急,急,急 堿度,電導(dǎo)率,都上升
2012-09-28 21:16:26
971
3
- 急求關(guān)于示波器csv格式的問題
- 我用tek的示波器想保存圖片,但是保存成了csv格式,顯示的是數(shù)據(jù),我能把它轉(zhuǎn)化為圖片格式么?... 我用tek的示波器想保存圖片,但是保存成了csv格式,顯示的是數(shù)據(jù),我能把它轉(zhuǎn)化為圖片格式么? 展開
2009-12-02 04:14:19
598
3
- 關(guān)于染整工藝學(xué)論文怎么寫??急求!??!
2013-11-18 03:52:35
320
1
- 急求可以破壞水表面張力的化學(xué)物質(zhì)
2011-05-04 11:32:16
411
2
- 環(huán)境問題 地理 急!!
- 變暖溫室效應(yīng)? 北京的環(huán)境問題(e.g.:北京今年很冷但沒下雪,沙塵暴......) 分析造成該環(huán)境問題的原因 并探索解決該環(huán)境問題應(yīng)采取的對策 P.S:字數(shù)越多越好
2009-02-06 08:16:43
369
5
- 求醫(yī)學(xué)影像技術(shù) 論文題目 關(guān)于MRI方面的
2011-01-11 07:21:01
402
1
- 急求:關(guān)于數(shù)電簡易數(shù)字頻率計的設(shè)計
- 急求: 要求: ⑴.設(shè)計一個簡易數(shù)字頻率計,用于測量數(shù)字信號的頻率并顯示,用一個開關(guān)控制頻率計的起動和停止,并可對頻率計置數(shù)。 ⑵.測頻范圍為0.1Hz到9999Hz。 ⑶.測量所需時基時間可調(diào),分1秒和10秒兩檔。 ⑷.能連續(xù)循環(huán)測量顯示,若用1秒檔時要求6秒完... 急求: 要求: ⑴.設(shè)計一個簡易數(shù)字頻率計,用于測量數(shù)字信號的頻率并顯示,用一個開關(guān)控制頻率計的起動和停止,并可對頻率計置數(shù)。 ⑵.測頻范圍為0.1Hz到9999Hz。 ⑶.測量所需時基時間可調(diào),分1秒和10秒兩檔。 ⑷.能連續(xù)循環(huán)測量顯示,若用1秒檔時要求6秒完成一個循環(huán),其中1秒計數(shù)測量;4秒顯示結(jié)果;1秒清零。然后依次循環(huán)。10秒檔則60秒完成一個循環(huán)。 常見的元器件選擇: ?74160(74161),10進制(16進制)計數(shù)器?555,?7474 雙D觸發(fā)器?7400(2輸入端,4與非門),?7404(6非門),?7408(2輸入,4與門)?7420(4輸入,2與非門), ?7432(2輸入端,4或門),?7421(4輸入端,雙與門),?7411(3輸入端,3與門),?7410(3輸入端,3與非門),?7402(2輸入端,4或非門),?7427(3輸入端,3或非門), 展開
2014-06-07 23:28:34
574
2
- 急求翻譯下面這段測繪工程方面的文章
- REAL-TIME KINEMATIC GPS Real-Time Kinematic (RTK) is Trimble Navigation's Site Surveyor System available as a standard option upgrade to Trimble's 4000 series SE and SSE receivers. The Medicine Bow National Forest uses 4000 SSE and SE rece... REAL-TIME KINEMATIC GPS Real-Time Kinematic (RTK) is Trimble Navigation's Site Surveyor System available as a standard option upgrade to Trimble's 4000 series SE and SSE receivers. The Medicine Bow National Forest uses 4000 SSE and SE receivers in it's Boundary Management program. The use of RTK enables a surveyor to determine a corner's position, establish a corner without having to make traditional corner moves or to mark and post line as quickly as the surveyor could walk, all without having to post-process the data. The surveyor using RTK can perform corner search within a meter or a couple of centimeters of the true location without the need to traverse down the line. For some survey applications traditional kinematic GPS field procedures are preferred, since many points can be observed in a short period of time with occupation times of a minute or less. However until now, kinematic surveying required post-processing before the results were available. This made field stakeout of corner positions, corner search, line marking and posting, and evaluation of coordinate accuracy in the field impossible to do using kinematic techniques (Curry et al 1993). Now, the use of RTK technology makes these impossible traditional kinematic tasks possible. What is RTK? RTK is currently carrier phase observations processed (corrected) in real-time resulting in position coordinates to a 1-2 centimeter accuracy level being available to the surveyor in the field. In other words, what the surveyor sees is what he gets. RTK, consists of two or more GPS receivers, three or more radio-modems, a "fixed-plate initializer" , and a handheld survey data collector/computer (TDC1). In RTK, one receiver occupies a known reference station and broadcasts a correction message (Compact Measurement Record or CMR2) to one or more roving receivers. The roving receivers process the information to solve the WGS-84 vectors by solving the integers in real-time within the receiver to produce an accurate position relative to the reference station. Precision of RTK is +/-2 cm + 2 ppm, with 1 ppm equating to 1 mm per 1 km (Trimble Navigation, 1993). The TDC1 is used to graphically display the processed results of the surveyors current position on the ground at that moment. The TDC1 has the capability for the surveyor to navigate within a couple of centimeters to a known or unknown coordinate position using Local, State Plane or Geographic coordinates. In real-time positions may be logged in the field, inverses performed, attributes (features) recorded, azimuths and distances between points calculated, and corners located. RTK, as with traditional kinematic GPS procedures, currently requires continuous satellite lock to be maintained. This restriction allows for RTK to be most effective in a non-canopied, no obstructions environment. 展開
2009-06-04 09:20:37
550
1
- 關(guān)于示波器 ~~急
- 1.測量一個Vp-p=2V的信號,如果要使其再顯示屏的垂直方向上盡可能大,但又不能超出顯示屏的有效位置,則Y軸靈敏度開關(guān)應(yīng)放在什么位置中?2.要測量一個f=200HZ的信號,如果要求信號在水... 1.測量一個Vp-p=2V的信號,如果要使其再顯示屏的垂直方向上盡可能大,但又不能超出顯示屏的有效位置,則Y軸靈敏度開關(guān)應(yīng)放在什么位置中? 2.要測量一個f=200HZ的信號,如果要求信號在水平方向上現(xiàn)實兩個周期的波形,則示波器水平速度旋鈕應(yīng)調(diào)到什么位置?? 3.示波器輸入端的“交流”(AC),“直流”(DC)耦合方式分別表示什么含義? 謝謝啦 ~ 展開
2011-05-08 04:46:39
448
1
- 急!急!急!求一篇關(guān)于提高石油采收率的方法及效果分析的論文
- 急!急!急!求一篇關(guān)于提高石油采收率的方法及效果分析的論文,1W字左右~Z好有大綱!如果寫的好~在追加50分??!高手們幫幫忙啊!小弟馬上就畢業(yè)了~急?。?.. 急!急!急!求一篇關(guān)于提高石油采收率的方法及效果分析的論文,1W字左右~Z好有大綱!如果寫的好~在追加50分?。「呤謧儙蛶兔Π。⌒〉荞R上就畢業(yè)了~急?。? 展開
2009-03-27 01:12:50
422
2
- 求ZY記錄臺的一個關(guān)于水紀錄片
- 求ZY臺的一個紀錄片,大概是五一。節(jié)左右放的,,關(guān)于水的,我當(dāng)時看叫《水漫世界》,但是在網(wǎng)上又沒找到,主要內(nèi)容說現(xiàn)在水平面一直在上升,其原因及對未來水會淹沒世界的分析。。... 求ZY臺的一個紀錄片,大概是五一。節(jié)左右放的,,關(guān)于水的,我當(dāng)時看叫《水漫世界》,但是在網(wǎng)上又沒找到,主要內(nèi)容說現(xiàn)在水平面一直在上升,其原因及對未來水會淹沒世界的分析。。謝謝!! 展開
2012-04-30 18:10:04
388
1
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