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【单选题】
变压器的铜损与负载的关系是（）。
A.
与负载电流成正比
B.
与负载电流的平方成正比
C.
与负载电流的平方成反比
D.
与负载无关
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【单选题】用系统命名法命名时,化合物CH3CH(CH3)CH2COOH应称为()
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【单选题】用系统命名法命名时,化合物CH3CH(CH3)2COOH应称为()。
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