多项选择题

下列项目中属于变动成本的是( )。
A、直接材料费
B、直线法计提的折旧费
C、直接人工费
D、按销量支付的佣金

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4-4磁粉检测是利用漏磁现象来检测材料和工件中缺陷的方法。( )

答案：正确

单项选择题

During the period between World War I and World War II,

A．the major European powers and the U.S. returned to the gold standard and fixed exchange rates.
B．while most countries abandoned the gold standard during World War I, international trade and investment flourished during the interwar period under a coherent international monetary system.
C．the U.S. dollar emerged as the dominant world currency, gradually replacing the British pound for the role.
D．None of the above.