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【单选题】
右图所示装置可用于测定空气中氧气的含量，实验前在集气瓶内加入少量水，并做上记号．下列说法中不正确的是（ ）A.
该实验证明空气中氧气的含量约占1/5
B.
实验时红磷一定要足量
C.
红磷燃烧产生大量的，火焰熄灭后立刻打开弹簧夹
D.
实验前一定要检验装置的气密性
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【简答题】Children are used to the parties that consist of junk food, loud music and the like．However, today's environmental condition is serious, so to save our environment, we need to do our bit by sma...
【单选题】Their loud parties have recently caused a number of ________ from the other people in their building.
A.
determinations
B.
complaints
C.
congratulations
D.
attitudes
【单选题】Their loud parties have recently caused a number of _____ from the other people in the building.
A.
compositions
B.
communications
C.
competitions
D.
complaints
【简答题】wild parties h ________
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