润滑油系统的蓄压器起什么作用?
参考答案:
蓄压器在油路中起稳定油压、吸收压力脉动和缓冲作用;当主油泵跳车而辅油泵启动这一瞬间,也起应急作用,使油压不致出现降低而使联锁动作停车。
The Green family ________ China for five years.
A. has come to B. has been in C. has been to
He failed to carry out some of the provisions of the contract, and now he has to ______ the consequences.
A.answer for
B.run into
C.abide by
D.step into