PR值

题型:名词解释

问题:

PR值

考点:机电工程机电工程题库
题型:名词解释

下列四组词语中没有错别字的一组是 

A.甘冒不韪简练从中斡旋边陲

B.骁勇善战赝品一切就序亟待

C.寒喧客套半晌苦心孤旨轶事

D.向隅而泣肄业改弦更张慎密

题型:名词解释
Jeff goes to work _____ and his wife goes to work _____.

A. by car, on her bike
B. by a car, on her bike
C. by cars, by bikes
D. by his car, by bike
题型:名词解释

组合绝缘的水冲洗工具工频泄漏电流试验时的水电阻率为1500Ω²cm(适用于500kV及以下的电压等级)。

题型:名词解释

临时上井架人员必须经()允许,并系好保险带。

A、队长

B、司钻

C、技术员

D、井架工

题型:名词解释

当对信号进行采样时,为了避免信号混淆,选用的采样频率fs和被测信号最高频率fm应满足()。

A、fs≥2×fm

B、fs=fm

C、fs≤fm

D、fs≤2×fm8

更多题库