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• 2018-11-23 20:00發(fā)布了問答

  高壓蒸汽滅菌前滴定管怎樣包裹

  　

  579人看過

• 2017-11-26 04:10發(fā)布了問答

  手套箱里的usb接口干什么用的

  　

  1152人看過

• 2017-11-17 21:15發(fā)布了問答

  usb問題，u盤插手套箱的接口，為什么無法讀取信息

  　

  408人看過

• 2017-10-09 05:16發(fā)布了問答

  超聲波洗衣機好用嗎？到底可以洗凈衣服嗎

  請求用過的朋友介紹一下，越詳細越好

  639人看過

• 2017-07-27 02:35發(fā)布了問答

  手提式和脈動式高壓鍋滅菌器哪個好

  　

  475人看過

• 2016-09-21 03:45發(fā)布了問答

  2級生物安全室里需要高壓滅菌鍋嗎

  　

  316人看過

• 2016-05-27 10:55發(fā)布了問答

  潔盟超聲波清洗機能清洗眼鏡嗎？

  314人看過

• 2016-04-21 18:41發(fā)布了問答

  高爾夫6手套箱照明燈泡怎么更換

  　

  452人看過

• 2015-11-22 03:08發(fā)布了問答

  新天籟 副駕駛的手套箱則么拆把

  　

  382人看過

• 2015-05-02 02:58發(fā)布了問答

  在什么條件下，壓力表上的壓力和溫度才有一致的關(guān)系(高壓蒸汽滅菌)

  　

  834人看過

• 2014-11-19 20:18發(fā)布了問答

  怎么在安瓿瓶中加入酒精并密封

  請問有誰可以介紹個生產(chǎn)商在這種安瓿瓶中加入酒精并封裝。瓶直徑7.5mm，高58mm，加入酒精略多于2/3。... 請問 有誰可以介紹個生產(chǎn)商在這種安瓿瓶中加入酒精并封裝。 瓶直徑7.5mm，高58mm，加入酒精略多于2/3。 展開

  561人看過

• 2013-08-03 13:20發(fā)布了問答

  法拉第的歷史事跡

  關(guān)于他的歷史事跡關(guān)于他在電磁學(xué)領(lǐng)域所做出的貢獻

  509人看過

• 2012-10-31 04:36發(fā)布了問答

  過氧化氫與聚維酮碘哪個消毒效果好?各有什么不同作用?

  　

  321人看過

• 2011-03-15 16:24發(fā)布了問答

  過氧化氫滅菌器的滅菌原理？有誰知道有哪幾種國外品牌？

  　

  423人看過

• 2009-02-19 01:05發(fā)布了問答

  英文翻譯

  Determination of the Illuminating Power of Chal-gas.—The value of coal-gas naturally depends chiefly on its .illuminating power. This can be determined in various ways. Of these， the most practically useful and easiest is the photometri... Determination of the Illuminating Power of Chal-gas.—The value of coal-gas naturally depends chiefly on its .illuminating power. This can be determined in various ways. Of these， the most practically useful and easiest is the photometric method， the amount of light emitted by a gas flame， burning at the rate of five cubic feet per hour， being compared with that given off by a standard sperm candle consuming 120 grains of sperm (7*79 grams) per hour. For this purpose， Btmsen's photometer， see Fig. 211， is employed. This depends upon the fact that the intensity of the illumination from a luminous point is inversely proportional to the square of the distance of the illuminated surface from that point. For flames- of coal-gas or candles， this law is of course only approximately true， but sufficiently so for practical purposes， and it， therefore， serves as the basis of a useful， though not very accurate， method of testing the illuminating power of coal-gas. All that is neces-* savy is to ascertain the distances at which the standard candle and the gas-flame both produce the same illuminating effect; it then only remains to take the squares of these distances in the inverse order to obtain the relative illuminating power of the two sources of the light. In Bunsen's photometer， the surface illuminated by the candle- and gas-flames， consists of a diaphragm of paper， Fig. 211， which， with the exception of a small circle in. the centre， Fig. 212， has been painted over with a solution of spermaceti in benzene， which renders the whole surface， with the exception of the central disc， transparent. This diaphragm is placed in a frame fixed to a moveable slide， which fits on to the long divided tod of the photometer (o'o)， Fig. 211. Over this frame is placed a black shade containing two pieces of mirror-plate ao fixed， that when the observer looks at the diaphragm in a direction at right angles to the divided rod， he sees in the two mirrors a reflection of each side of the waxed paper At the right hand extremity of the rod is fixed the standard candle， whilst at the other the gas flame is allowed to burn， the rate of its combustion being accurately determined by means of the experimental gas-meter (p). 展開

  557人看過