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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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A.
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D.
D
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A.
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B.
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【单选题】—__________ yogurt do we need? —Two cups.
A.
How many
B.
How about
C.
How much
D.
How long
【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
A.
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How often
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How long
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A.
How much
B.
How long
C.
How often
D.
How many
【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。( )
A.
正确
B.
错误
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