不定项选择

如果两个叶轮符合几何相似条件与动力相似条件，则称其为工况相似的叶轮。

A．正确
B．错误

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单项选择题

Each student got an EnglishChinese dictionary.
The students each a dictionary.

A．have; has
B．has; have
C．have; have
D．has; has

单项选择题