起重机位置限制器与调整装置有( )。
A.上升级位置限制器
B.缓冲器
C.夹轨器
D.运动极限位置限制器和显示装置
E.偏斜调整装置
参考答案:A,B,D,E
匹维溴铵的作用机制为()
A.M受体阻断剂
B.β受体阻断剂
C.M受体激动剂
D.钙拮抗剂
E.钠拮抗剂
Everything ()if Albert hadn't called the fire brigade.
A.will be destroyed
B.will have been destroyed
C.would bedestroyed
D.would have been destroyed