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请判断吸光度的准确度合格性 用1cm吸收池,以硫酸溶液(1+100)为参比溶液,在表3中规定的波长处测定硫酸铜溶液 1) 的吸光度,标准吸光度值见表3。测定相对误差为±1%。 波长,nm 650 700 750 A 真 0.224 0.527 0.817 A 测 0.228 0.545 0.911
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【单选题】It’s too bad that I failed in the math exam. If only I ___________________ hard at it! A. worked B. had worked C. has worked D. would work
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B.
C.
D.
D
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【单选题】Why did he stand at the back of the theater after he got back from the car?
A.
Because he was still worried.
B.
Because he didn't like to sit in the middle of the row.
C.
Because he couldn't find his seat again.
D.
Because he didn't like to bother the people again.
【单选题】Whats the topic discussed in this passage?
A.
Why people hold back their tears.
B.
Why people cry.
C.
How to restrain one's tears.
D.
How tears are produced.
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【单选题】I can't figure out ____ you didn't call Ted back that day. [ ]
A.
why it was that
B.
it was why that
C.
why was it that
D.
that it was why
【简答题】Why did he stand at the back of the theatre after he got back from the car? Because he didn't want to ______ in his row again.
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