用于描述生产过程平均质量的是( )。 A．批质量 B．接收质量限AQL C．极

下图中，调节天平横梁平衡的操作中错误的是           。用测电笔检测火线的操作中错误的是                            。

睑弦赤烂的基本症状是（）

A.睑弦红赤

B.睑弦赤烂，灼热刺痒

C.睑弦有脓泡、结痂

D.睑弦可见溃疡、出血

E.睫毛脱落稀疏

刃磨后的刀具从开始切削一直到达到（）为止的总切削时间，称为刀具寿命。

A、刀具崩刃

B、磨钝标准

C、急剧磨损阶段

D、刀具报废

A crew member is unconscious and the face is flushed. You should（）.

A.lay the crew member down with the head and shoulders slightly raised

B.administer a liquid stimulant

C.lay the crew member down with the head lower than the feet

D.attempt to stand the crew member upright to restore consciousness

什么是鼠害化学防治？