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三相异步电动机的理想空载运行

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维生素B2的化学名称为()。

A. 生育酚
B. 硫胺素
C. 核黄素
D. 视黄醇

()can be regarded as a vessel restricted in her ability to maneuver.

Any aircraft designed to maneuver on the water
B. A vessel engaged in dredging,surveying or underwater operations
C. A vessel under sail provided that propelling machinery is not used
D. A small vessel sailing at night

到目前为止,我国总共已经推广了多少套广播体操?()

A. 17套
B. 18套
C. 19套
D. 20套

布莱克认为社会学模式关注的焦点是规则而不是社会结构。

A. 正确
B. 错误

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