【简答题】紫外线照射导致DNA的损伤是使DNA链上形成()二聚体。
【判断题】当某一波长的单色光照射某溶液时,若T=100%,说明该溶液对此波长的光无吸收。
【简答题】Exercise: Choose the proper phrases in its appropriate form to fill each blank in the following sentences. hold out hold back hold down hold off ■ The dam was not strong enough to 1 the flood wa...
【单选题】64D型半自动闭塞办理好闭塞后,电力停电又来电后()。
【单选题】“a=4' b1101,b=4' bx110”选出正确的运算结果( )
【判断题】Hydropower systems build pressure either by containing the water behind a dam, or within a pipe that runs down a hill. The weight of the water behind the dam or in the pipe creates pressure at the bot...
【多选题】朗伯-比尔定律的公式,及物理意义
B.
当一束平行单色光垂直通过某一具有一定光照面积的、含吸光物质的稀溶液时,若该溶液均匀、无散射,则在入射光波长、强度及溶液的温度等条件保持不变的情况下,该溶液中的吸光物质对单色光的吸光度A与溶液的浓度c及溶液液层厚度L的乘积成正比关系。
C.
当一束平行单色光通过某一具有一定光照面积的、含吸光物质的溶液时,若该溶液均匀、无散射,则在入射光波长、强度及溶液的温度等条件保持不变的情况下,该溶液中的吸光物质对单色光的吸光度A与溶液的浓度c及溶液液层厚度L的乘积成正比关系。
【简答题】听下面一段对话,回答1-4题。 1. What do we learn from the passage? A. More can be done to reduce the damage of earthquake B. Earthquakes always cause serious damage C. Nothing can be done to reduce the damage of e...
【单选题】64D型半自动闭塞办理好闭塞后,电力停电又来电后()。