未知题型

What does Mary do Where does she work __________________________________________________

What does Mary do Where does she work ________________________________________________________________________________________________________________________________________________________________________________

【参考答案】

She is doing research into genetic engineering together with......

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单项选择题逻辑式F = A＋B＋C 可变换为

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B、F= C＋A＋B
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采用多刀同时加工多个表面视为一个复合工步。

未知题型采用多刀同时加工多个表面视为一个复合工步。