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【单选题】
伯努利方程的物理意义可表述为A.
两点的动能不变
B.
两截面的流量不变
C.
两截面的动量不变
D.
两截面的总机械能不变
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】在分光光度法中,待测物浓度的相对误差△C/C的大小
A.
与吸光度A成反比
B.
与透光度的绝对误差成反比
C.
与透光度T成反比
D.
在A=0.2～0.8时,其数值是较小的
【单选题】-__________ -By bus. [ ]
A.
Why does he go to work?
B.
How does he go to work?
C.
When does she go to work?
D.
Where does he work?
【单选题】听力原文：W: Hi, Jim! M: Hi, Mary! Where is Hill? W: Oh, he's probably at home. M: Why? W: He drank too much last night. M: Now we have to do this work without him. W: Even when he comes, he's too lazy to ...
A.
He is at home.
B.
He is in the office.
C.
He is on the way home.
【简答题】The reason why he was removed was ______he was careless and dishonest. A,when Bbecause C,that D,what
【简答题】阅读理解。 Excuses! Excuses ! Harry was often late for school, and when the teacher asked him why he was late he always had an excuse. ' My alarm clock didn't go off,' he said one morning. 'The bus broke...
【单选题】Its uncertain______.
A.
why did he do it
B.
why does he do it
C.
when did he do it
D.
whether he did it or not
【简答题】A．When he was six. B．When he was twentyone. C．When he was thir. D．When he was eigh.
【单选题】-----__________ ----By bus.
A.
How does he go to work?
B.
Why does he go to work?
C.
When does she go to work?
D.
Where does he work?
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