“防浪阀”
参考答案:
是指安装在液压舵机主油路上的两组单向阀,主要作用是随时将由风浪引起对舵叶撞击形成的压力高峰值泄掉,保护舵叶不损坏。
13.—Jane, you have held a wonderful party.
—_____.
A.Surely it is
B.I am glad you enjoyed yourselves
C.Thanks a lot
D.Why, that’s right
When I stepped into the classroom, I saw the teacher _____ out the test papers.
A.hands
B.handed
C.to hand
D.handing