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【简答题】
液压控制阀在液压系统中被用来控制液流的 、 和 ,保证执行元件按照要求进行工作,属控制元件。
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反馈参考答案：
举一反三
【单选题】---Excuse me, Sir, could you tell me how to go to the railway station? ---Sorry, you’d better ask, I’m afraid, ____ is a native.
A.
whom
B.
who
C.
whomever
D.
whoever
【单选题】--- Would you please ____ _ her _____ me back? --- All right, I will tell her.
A.
ask, to call
B.
ask, call
C.
to ask, call
D.
to ask, to call
【单选题】I could have done it for you if you______.
A.
ask me to
B.
asked me to
C.
have asked me to
D.
had asked me to
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