把制动器衔铁推至铁芯上，制动瓦块松开，然后转动调节螺栓来调整（）。
A、制动力
B、制动力矩
C、间隙
D、接触面积
参考答案：C
The teacher called Tom to his office because he was caught_____in the exam.
A．to cheat
B．cheating
C．cheated
D．cheat
衰老桃树如何更新？
