截止阀主要由阀体、阀盖、阀杆、阀杆螺母、阀瓣、阀座、填料函、密封填料、填料压盖及传动装置等组成。
参考答案：对
__________, I really believe that I’d prefer not to make any change now.
A．Considered all the possibilities
B．Taken all the possibilities into consideration
C．Taking all the possibilities into consideration
D．Giving all the possibilities
天命之谓性，（），修道之谓教。
A.无为之谓道
B.修身之谓道
C.率性之谓道
D.明诚之谓道
