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【单选题】
本设备上使用的传感器工作电压一般为( )。
A.
12V
B.
24V
C.
36V
D.
6V
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A.
总成本由固定成本和变动成本两部分组成
B.
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C.
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A.
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B.
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A.
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B.
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C.
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D.
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A.
it is easy to do something when it is your first time.
B.
it won't be easy  because they haven't done it many times.
C.
it is easy to say something but often hard to do it.
D.
it won’t be easy, especially because they don't have experience.
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A.
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B.
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D.
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B.
don't you
C.
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