箱式制动器由制动缸.（）、闸瓦间隙调整装置及闸瓦装置组成。
参考答案：制动杠杆
This is just between you and me. You _________ tell anyone about this. [ ]
A. mustn't
B. can
C. should
D. have not to
晶闸管三个电极分别叫做（）.
A．阳极阴极和控制极
B．阳极阴极和栅极
C．屏极阴极和控制极
D．漏极源极和栅极
