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【多选题】
采购领导制度有( )。
A.
集中制
B.
分散制
C.
混合制
D.
多维制度
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A.
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B.
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C.
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D.
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【单选题】对于下列各对分子,分子间存在的作用力类型最多的是
A.
H2O和HF
B.
N2和H2O
C.
Ar和N2
D.
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E.
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【单选题】N 2 分子间存在的作用力是 ( )
A.
氢键
B.
取向力
C.
色散力
D.
诱导力
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