下列关于流体压强与流速的关系说法正确的是( ) A.气体压强的大小与流速无关 B

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问题:

下列关于流体压强与流速的关系说法正确的是(  )

A.气体压强的大小与流速无关

B.在气体中,流速大的地方压强大

C.在气体中,压强小的位置气体的流速一定大

D.在气体中,流速越大的位置压强越小

考点:流体压强和流速的关系
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Mr. and Mrs. Smith always spent their holiday in London in the past, staying in a small inn at the foot of a hill. One year, however, Mr. Smith made a lot of money in his business, so they decided to go to New York and stay at a really good hotel while they went touring around that famous city.
They flew to New York and arrived at their hotel late one evening. They expected that they would have to go to bed hungry, because in that small inn in London, no meals were served after seven. They were therefore surprised when the man who received them in the hall asked whether they would take dinner there that night.
"Are you still serving dinner" asked Mr. Smith.
"Yes, certainly, sir," answered the man. "We serve it until haft past nine."
"What are the meals then" asked Mr. Smith.
"Well, sir," answered the man, "We serve breakfast from seven to half past eleven in the morning, lunch from twelve to three in the afternoon, tea from four to five. And dinner from six to half past nine."
"But that hardly leaves any time for us to see the sights of New York," said Mrs. Smith.

Mrs. Smith ______ .
[A] thought she would have plenty of time to see the sights
[B] was afraid they would have no time to travel around New York
[C] thought the hotel was not good as small inn

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A类电气装置包括交流标称电压为()的发电、变电、送电和配电电气装置(含直流电气装置)。

A.500kV及以下

B.300kV及以下

C.200kV及以下

D.100kV及以下

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青壮年疝()

A.Ferguson法

B.Bassini法

C.Vay法

D.疝成型术

E.保守疗法

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钟摆滚筒高位报警原因有?

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CLK的含义为().

A.数据

B.时钟

C.挂机

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