发生贝尔面瘫后上下眼睑不能闭合的原因是（） A.眼轮匝肌瘫痪 B.展神经损伤 C.动

The employees were tired of working ________ hours and some of them even gave up their work.  [ ]

A. special

B. extra

C. especial

D. spare

高强度钢内部晶粒变大熔合后，强度（）。

A．不变

B．变大

C．变小

设备点检的种类有（），专业点检和精密点检。

家畜