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【单选题】
用离心泵在两个敞口容器间输送液体，若维持两容器的液面高度不变，改输送密度较大的流体，其他条件不变，则A.
流量不变
B.
压头增大
C.
泵的轴功率不变
D.
泵出口出的压力表读数不变
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举一反三
【单选题】Football is a ________ of a sharp mind and hard training rather than just talking. [ ]
A.
mixture
B.
thought
C.
entertainment
D.
action
【单选题】Football is a _____ of a sharp mind and hard training rather than just talking. [ ]
A.
mixtu re
B.
thought
C.
time
D.
action
【简答题】课堂上布置的测试题填空题的答案在这里上传
【单选题】Talking of football, have you ever seen the Italian team( )?
A.
played
B.
playing
C.
to play
D.
play
【简答题】听对话，回答问题。 1. What kind of match are they talking about? A. Football. B. Volleyball. C. Basketball. 2. Which school did Lucy's school play against? A. No.15 Middle School. B. No.5 Middle School. C. No....
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