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【简答题】
流绒压力系数定义为 。 它是 的切线斜率冠以负号。流里一压力系数表示阀开度一定时负载压降变化所引起的负载流量变化大小。 值小, 的能力大,即阀的 大。从动态的观点看, 是系统中的一种 ,因为系统振动加剧时,负载压力的增大使阀输给系统的流过减小,这有助于系统振动的衰减。
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【单选题】Which of the following is NOT true according to the author?
A.
The renovation project cost 300 million yuan.
B.
The temple was once a part of Beijing No. 159 Middle School.
C.
Those parts of the temple too destroyed to repair are still them.
D.
The temple was built about 470 years ago.
【单选题】Which of the following is NOT true according to the author?
A.
The renovation project cost 300 million yuan.
B.
The temple was once a part of Beijing No. 159 Middle School.
C.
Those parts of the temple too destroyed to repair are still there.
D.
The temple is located on the north side of Fuchengmennei Dajie.
【简答题】进口配额制主要包括全球配额和 。
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