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• 2018-11-23 20:00发布了问答

  高压蒸汽灭菌前滴定管怎样包裹

  　

  523人看过

• 2017-11-26 04:10发布了问答

  手套箱里的usb接口干什么用的

  　

  1015人看过

• 2017-11-17 21:15发布了问答

  usb问题，u盘插手套箱的接口，为什么无法读取信息

  　

  350人看过

• 2017-10-09 05:16发布了问答

  超声波洗衣机好用吗？到底可以洗净衣服吗

  请求用过的朋友介绍一下，越详细越好

  526人看过

• 2017-07-27 02:35发布了问答

  手提式和脉动式高压锅灭菌器哪个好

  　

  398人看过

• 2016-09-21 03:45发布了问答

  2级生物安全室里需要高压灭菌锅吗

  　

  262人看过

• 2016-05-27 10:55发布了问答

  洁盟超声波清洗机能清洗眼镜吗？

  223人看过

• 2016-04-21 18:41发布了问答

  高尔夫6手套箱照明灯泡怎么更换

  　

  398人看过

• 2015-11-22 03:08发布了问答

  新天籁 副驾驶的手套箱则么拆把

  　

  331人看过

• 2015-05-02 02:58发布了问答

  在什么条件下，压力表上的压力和温度才有一致的关系(高压蒸汽灭菌)

  　

  776人看过

• 2014-11-19 20:18发布了问答

  怎么在安瓿瓶中加入酒精并密封

  请问有谁可以介绍个生产商在这种安瓿瓶中加入酒精并封装。瓶直径7.5mm，高58mm，加入酒精略多于2/3。... 请问 有谁可以介绍个生产商在这种安瓿瓶中加入酒精并封装。 瓶直径7.5mm，高58mm，加入酒精略多于2/3。 展开

  490人看过

• 2013-08-03 13:20发布了问答

  法拉第的历史事迹

  关于他的历史事迹关于他在电磁学领域所做出的贡献

  428人看过

• 2012-10-31 04:36发布了问答

  过氧化氢与聚维酮碘哪个消毒效果好?各有什么不同作用?

  　

  261人看过

• 2011-03-15 16:24发布了问答

  过氧化氢灭菌器的灭菌原理？有谁知道有哪几种国外品牌？

  　

  334人看过

• 2009-02-19 01:05发布了问答

  英文翻译

  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). 展开

  475人看过