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单项选择题

水流过水断面上压强的大小和正负与基准面的选择( )。

A.有关
B.无关
C.大小无关正负有关
D.以上均有可能
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判断题
反射事指不同的位置对称插入相同的材料以产生镜子的映射效果的一种表现技巧()
A、正确
B、错误
单项选择题
两台离心式水泵串联工作，串联泵的设计流量应是接近的，否则就不能保证两台泵在高效率下运行，较大泵的容量不能充分发挥作用，或较小泵容易产生( )。
A.功率过高
B.转速过高
C.流量过小
D.扬程过高
单项选择题
21.5 Liquidated damages 
This clause aims to avoid under compensation by stating the amount of money which shall be payable in the   (16)    of a breach of contract. Such a clause enables those involved to know in advance the extent of their potential liability and to plan  _     . In practice, though, the courts have        a jurisdiction to control the contents of such clauses. 
The rules which the courts have established are the following. If the clause represents a genuine pre-estimate of the loss which is likely to be        because of the breach, then it is a ‘liquidated damages clause’ and is enforceable. The sum         in the clause is the sum recoverable, even though that sum may be greater or smaller than the actual loss. But if the sum stated in the clause is not a genuine pre-estimate of loss, it is a ‘penalty clause’ and is unenforceable. 
A、
fact   
B、event
C、incident 
D、result
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