单项选择题

三相异步电动机在运行中提高其供电频率，该电动机的转速将( )。
(a) 基本不变 (b) 增加 (c) 降低 (d) 无法判断

A．d
B．b
C．c
D．a

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单项选择题

Which of the following statements about the curve of Spee is correct()

A．It is the sagittal curve of occlusion of the maxilla.
B．It is the sagittal curve of occlusion of the mandible.
C．It is the transverse curve of occlusion of the maxilla.
D．It is the transverse curve of occlusion of the mandible
E．None of the above is correct.

物流标准化是我国物流企业进军国际物流市场的通行证。
正确
错误

答案：正确