Grandpa: Robbie, we’ ll go fishing soon, and we’ll takeyour Dad with us.
Grandson: I’m ready.
Grandpa: ________
A.You name the day.
B.Enjoy yourselves.
C.You can ’ t miss it.
D.Take your time.
第9题
A.离心泵的工作寿命越短
B.离心泵的扬程就越低
C.离心泵的流量就越少
D.离心泵的性能越差
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