题目内容

According to paragraph 13, we honor our heroes by ______________________.

A. fulfilling our duties in everyday life
B. working to change the circumstances that led to their death
C. admitting and admiring their heroism
D. acting heroically ourselves

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"We expect nothing less" in paragraph 12 means ______more than 5 words___________.

在分光光度法中,吸光度和透光度的关系是下列四个中的哪一个______。

A=1gT
B. A=1g(1/T)
C. T=1gA
D. A=1n(1/T)

有甲乙两个不同浓度同一有色物质溶液,在相同条件下测得吸光度是甲为0.1,乙为0.2,则甲乙的浓度关系为______。

A. 甲是乙的2倍
B. 甲是乙的1/2
C. 甲等于乙
D. 甲是乙的1/4

某物质的摩尔吸光系数ε 很大,表明______。

A. 该物质溶液的浓度很大
B. 光通过该物质溶液的光程长
C. 该物质的灵敏度高
D. 测定该物质的灵敏度低

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