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【单选题】
测定大气中NO 2 时,需要在现场同时测定气温和气压,其目的是()A.
了解气象因素
B.
换算标况体积
C.
判断污染水平
D.
了解气象因素，换算标况体积，判断污染水平
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举一反三
【单选题】Which of the following tag questions is INCORRECT? A. Carry this parcel for me, will you? B. Nobody wants to go there, does he? C. Few people know him, don’t they? D. Everything is ready, isn’t it?
A.
选择1
B.
选择2
C.
选择3
D.
选择4
【简答题】用25ml移液管移取25ml氢氧化钠溶液,应记为_________ml。
【单选题】_______he was a rising film star in China, but now few young people know him. [ ]
A.
At a time
B.
All the time
C.
At one time
D.
At times
【简答题】Which of the following tag questions is INCORRECT? A. Carry this parcel for me, will you? B. Nobody wants to go there, does he? C. Few people know him, don’t they? D. Everything is ready, isn’t it?A....
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