节流装置包括节流元件______，以及安装节流元件的______。
参考答案：取压装置；前后一段直管路
Our government has taken some measures to overcome the lack of electricity, but it may take some time _____ we have enough power．
A．since
B．after
C．unless
D．before
职业道德修养是指从业人员在道德意识和道德行为方面（）的过程。
A.自我修炼
B.锻炼
C.培养
