题目内容 (请给出正确答案)
[主观题]

Almost every family buys at least one copy of a newspaper every day. Some people subscribe

(订阅) to as many as two or three newspapers. But why do people read newspapers?

Five hundred years ago, news of important happenings—battles lost and won, kings or rulers overthrown(推翻) or killed—took months and even years to travel from one country to another. The news passed by word of mouth and was never accurate. Today we can read in our newspapers of important events that occur in far away countries on the same day they happen.

Apart from supplying news from all over the world, newspapers give us a lot of other useful information. There are weather reports, radio, television and film guides, book reviews, stories and, of course, advertisements. The bigger ones are put in by large companies to bring attention to their products. They pay the newspapers thousands of dollars for the advertising space, but it is worth the money, for news of their products goes into almost every home in the country. For those who produce newspapers, advertisements are also very important. Money earned from advertisements makes it possible for them to sell their newspapers at a low price and still make a profit.

Newspapers often have information on gardening, cooking and fashion, as well as a small but very popular section on jokes and cartoons(漫画) .

The habit of reading newspapers is______.

A.uncommon in the world

B.not popular in the U.S.A.

C.widespread in the world

D.founded among a few families

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第1题

流体运动中流过断面上的每一条流线上的流速大小和方向沿流程发生变化,这种流动称为()流动。

A、均匀

B、非均匀

C、有压

D、无压

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第2题

明渠均匀流是指:

A.速度方向不变,大小可以沿流向改变的流动

B.运动要素不随时间变化的流动

C.断面流速均匀分布的流动

D.运动要素沿流程不变的流动

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第3题

均匀流的定义是()。

A.流线皆为平行直线的流动

B.过流断面上各点流速相互平行的流动

C.断面平均流速沿流程不变的流动

D.各点流速皆相等的流动

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第4题

关于连续性方程,说法不正确的是()

A、对于定常流动,无论是可压缩流体还是不可压缩流体的流动,总流任意过流断面上质量流量相等且为一常量

B、对于不可压缩流体的流动,无论是定常流动还是非定常流动,沿总流任意过流断面上的体积流量相等且为一常量

C、总流过流断面上的平均流速与其面积成反比

D、对于不可压缩流体的流动,沿总流任意过流断面上的质量流量相等且为一常量

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第5题

()是流体运动中,各过流断面上相应点的流速(大小和方向)沿程不变的。A.均匀流B.非均匀流C.稳定流D.

()是流体运动中,各过流断面上相应点的流速(大小和方向)沿程不变的。

A.均匀流

B.非均匀流

C.稳定流

D.非稳定流

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第6题

液体质点沿轴向向前流动外,还有垂直流动方向的位移,流速大小和方向都随时发生变化,这种流动类型称为()

A.滞流

B.过渡流

C.层流

D.湍流

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第7题

液体质点沿轴向向前流动外,还有垂直流动方向的位移,流速大小和方向都随着发生变化,这种流动类型被称为()

A.滞流

B.过渡流

C.层流

D.湍流

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第8题

均匀流中沿流动方向各断面的断面平均流速相同。()
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第9题

液体质点流速的大小和方向沿流程不变的流动称为()。

A.有压流

B.无压流

C.恒定流

D.均匀流

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第10题

只要比较总流中两个渐变流断面上单位重量流体的______大小,就能判别出流动方向。
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