不定项选择

双闭环调速系统包括电流环和速度环。电流环为外环，速度环是内环，两环是串联的，又称双环串级调速。 ( )

A．错误
B．正确

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单项选择题

Doctor A and Doctor B have been arguing about whether to use one child for the experiment. Doctor A thinks that one child can be sacrificed, but 20000 children can be saved, so the experiment can be done. Doctor B said that life is sacred and cannot harm the life of an innocent child. Therefore, this experiment cannot be done. In this case, the ethical theory of doctor A is ( )

A． the theory of humanity
B． deontology
C． virtue theory
D． utilitarianism

单项选择题

导轨副的维护一般包括导轨副的润滑、滚动导轨副的预紧和导轨副的防护。
A、正确
B、错误