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【单选题】
两型号水泵对称并联运行时,其总流量为QI+II ,当一台水泵停车只剩一台运行时的流量为Q,若管路性能曲线近似不变,则有A.
ＱⅠ+Ⅱ>2Ｑ
B.
ＱⅠ+Ⅱ＝2Ｑ
C.
Ｑ
D.
ＱⅠ+Ⅱ＝Ｑ
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【单选题】—Tom looks very sad. What’s wrong _______ him? —An accident happened _______ his father this morning.
A.
to; with
B.
with; to
C.
for; to
D.
with; for
【简答题】I will give you his l______________(座机)number.
【简答题】某放大电路的电压放大倍数为1000倍,相当于____ dB;电压放大倍数为100倍,相当于____ dB。
【简答题】One day, little Roy was ill. So his mother took him to the clinic( 诊所 ). A doctor examined him and said : “ Well, boy, there is something wrong with you. I am afraid you need to get injections ( 输液 ) ...
【单选题】Tom got nothing in______ for her kindness,_____ made him very sad.
A.
award; as
B.
reward; which
C.
prize; which
D.
medals; as
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