题目内容
（请给出正确答案）
[多选题]
机械的有效工作时间包括 （）。
A.基本工作时间
B.辅助工作时间
C.正常负荷下工作时间
D.有根据降低负荷下工作时间
如搜索结果不匹配，请 联系老师 获取答案
A．bookstore
B．cinema
C．museum
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第5题
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第7题
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第8题
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第9题
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C．Americans looked down upon their own films.
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