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【单选题】
《剧毒化学品公路运输通行证》的有效期为()天。
A.
7
B.
10
C.
15
D.
30
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A.
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B.
we don’t afford it
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nor can’t it afford
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【单选题】如图所示,某正弦电流波形图,其瞬时值表达式为_____
A.
A
B.
A
C.
A
D.
A
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