转子转速n与旋转磁场转速n0之间存在的差值，被称之为（）。
A.转差率
B.转差
C.相位差
D.电位差
参考答案：B
— Mike is often absent from class.
— Tell him he _____ answer for it if he goes on behaving like that. [ ]
A. shall
B. will
C. would
D. can
芭比娃娃的首任设计师（）引用了高级女装的方法和样式来打扮她。
A.玛丽•匡特
B.纪梵希
C.可可•夏奈尔
D.夏洛特•约翰逊
