【单选题】Excessive humming of AC contactors may be caused by _______.
B.
shorted armature coils
【单选题】One of the trainees is ________complaining that she has to put in an excessive amount of overtime to finish the paperwork.
【多选题】设随机变量 相互独立,且 服从参数为 的泊松分布, 服从期望值为 的指数分布,则随机变量序列 不一定满足( )
【单选题】Excessive vibration in an operating diesel generator may be caused by _____.
B.
surging at governed RPM
C.
loose engine mounting bolts
D.
coolant leaking into the cylinder
【单选题】铣削箱体剖分面时,必须限制的自由度是()