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【简答题】
为了消除火焰原子化器中待测元素的发射光谱干扰,应采用下列那种措施 A. 直流放大 B. 交流放大 C. 扣除背景 D. 减小灯电流
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皮皮学刷刷变学霸
举一反三
【单选题】That's too expensive, I'll ______. [ ]
A.
think about it
B.
think of it
C.
think over it
D.
think it about
【简答题】阅读理解。 At the shopping mall, you probably think about spending, not saving. Think about all the lights that keep the mall bright. Think about all the water faucets (水龙头) in the toilet. Think about all ...
【简答题】铸坯皮下气泡产生的原因是什么？
【单选题】Air Pollution When people think about air pollution, they usually think about smog, acid rain, CFC's, and other forms of outdoor air pollution. But did you know that air pollution also can exist insid...
A.
Y
B.
N
C.
NG
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