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【单选题】
室外220V灯具距地面不得低于3m,室内220V灯具距地面不得低于( )m。
A.
3.5
B.
4.0
C.
2.5
D.
2.0
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【判断题】用法扬司法测定Cl-含量时,以二氯荧光黄(Ka=1.0010-4)为指示剂,溶液的PH值应大于4,小于10。( )
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【简答题】阅读简答题 a) How long can a human go without sleeping? b) What happens when you stay awake for eleven days? c) How much sleep do we need? d)What tricks do people use to try to stay awake? e)Can sleep depr...
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【单选题】( )3.— _____ bread do we need, Mom? — Two kilos, I think. A. How many B. How often C. How long D. How much
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