绞车没挂离合器,猫头轴就转动的原因不可能是()。
A.传动轴上滑动链轮的铜套卡住
B.离合器中落入了油
C.摩擦片磨损
D.柴油机飞车
参考答案:B, C, D
关于创伤局部反应的描述,下列哪一项不正确()
A.是非特异性反应
B.存在微循环障碍
C.与全身反应无关
D.具有防御作用
E.有炎症细胞浸润
________ your letter, I would have started off two days ago.
A.If I received
B.Should I receive
C.If I could have received
D.Had I received