容量在30~70kW的电动机转子向一侧轴向窜动范围为().
A.1.0mm
B.1.5mm
C.2.0mm
D.3.0mm
参考答案:A
Having lived in China for 8 years, Helen has a good ____________ of both English and Chinese.
A.ability
B.guidance
C.command
D.program
下列说法中,表示气候的是:
A.暴风骤雨
B.阴转多云
C.四季如春
D.今天午后大风