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【单选题】
下列各组分子中,化学键均有极性,但分子偶极矩均为零的是A.
NO2、PCl3、CH4
B.
CS2、BCl3、CH4
C.
NH3、BF3、H2S
D.
N2、CS2、PH3
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A.
put on
B.
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put off
D.
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A.
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D.
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A.
put on
B.
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C.
put off
D.
put out
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