下列实例中不属于利用大气压的是（） A锅炉液位计。 B抽水机抽_爱下问搜题

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问题选择题

下列实例中不属于利用大气压的是（）

A 锅炉液位计。 B 抽水机抽水。 C 钢笔吸墨水。 D 吸盘。

答案

答案：A

液位计观察锅炉内水位的高度，是应用了连通器的原理．故A不属于利用大气压．抽水机抽水是通过活塞上移或叶轮转动使抽水机内水面上方的气压减小，水在外界大气压的作用下，被压上来，B属于利用大气压；用力一按橡皮囊，排出了里面的空气，当其恢复原状时，橡皮囊内部气压小于外界大气压，在外界大气压的作用下，墨水被压入钢笔内，C用到了大气压，吸盘要固定在墙壁上，需要先用力挤压吸盘，把盘内的空气挤出，然后吸盘就被外界的大气压紧压在了墙壁上，所以在吸盘上挂毛巾吸盘也不会掉下来．故此现象与大气压有关;故选A．

填空题

After its (1) to the (2) in 2001, China has taken steps towards opening up its (3) . As a condition for joining the WTO, China (4) itself to a (5) of trade liberalization, including the reduction of tariffs on cars and agricultural products. These tariffs reductions are both (6) and there is (7) for China to (8) at a faster pace.
A (9) of (10) and a more rapid and profound reduction of import tariffs would (11) of those Chinese consumers who would (12) imported products at lower prices. Second, a higher (13) into China would take away much upward pressure on the Renminbi and provide a true and lasting (14) to solving current global (15) . Indeed, even a modest (16) in the opening-up process would go a long way towards solving the problem.
The opening up of China’s markets to international competition should (17) deep reforms. Banks should be recapitalized, bad loans provisioned fully and state-owned companies’ runaway indebtedness (18) . Only when real progress in these areas is made should China begin to consider a reform to its (19) . Doing it any earlier would be highly (20) .

单项选择题

房地产经营投资的目的不仅是为了（）原垫付的投资，而且要盈利。

A.增加

B.回收

C.支付

D.减少