液压泵安装后,需给()注油。
参考答案:泵体
I’m hoping that John will let us have the car tonight; __________, I’m afraid we won’t be able to go out.
A.even if
B.if so
C.what if
D.if not
短语是()和()都能搭配而没有()的一组词,是()的备用单位。