曲轴飞轮组一般有哪些零件组成？
参考答案：
曲轴飞轮组主要由曲轴、飞轮、扭转减振器、皮带轮、正时齿轮等组成。
解决争端的方法有( )。
A．调解
B．仲裁
C．利用法律手段
D．批评
E．放弃
The rated operating time of a self-contained breathing device may be reduced in actual use because of（）.
A.pressure differences in the atmosphere
B.the length of the hose attached to the facepiece
C.the physical exertion of the person wearing the device
D.spaces containing poisonous vapors
