台虎钳夹持工件时,应保护工件的加工面,夹紧度要适当,将工件()。A.夹得越紧越好 B

题型:单项选择题

问题:

台虎钳夹持工件时,应保护工件的加工面,夹紧度要适当,将工件()。

A.夹得越紧越好

B.夹牢而不夹扁

C.夹住即可

D.夹得稍松些

考点:石油钻井工考试初级石油钻井工初级石油钻井工题库
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International free trade occurs when there are no barriers to trade. Countries can get a lot of benefits from free trade. (31) , all countries choose to adopt protection policies to some extent In this essay, I will give (32) of the arguments in favour of world free trade, describe the methods for the trade protection policies (33) countries erect to protect domestic industries and give the arguments which can be put (34) to justify protectionist policies.
Tariffs are taxes on (35) products. Sometimes, tariffs are known (36) imports duties and customs duties. They can be used (37) raise revenue. But, they are usually used to (38) imports and also to help domestic producers. The effect of imposing (39) tariff is to raise price for domestic consumers, and some consumers will switch consumption (40) imported goods to domestically produced substitutes. (41) are two types of tariffs. One is percentage taxes, it is based on
percentage of value of goods. (42) one is specific (fixed sum taxes), it is based on a fixed tax (43) unit or weight. Quota is a limit on the supply of goods or services. It can be imposed on exports. The domestic market share will increase because of (44) a limit on the quantity of imported goods. However, the price of protected goods will also rise because a quota is to reduce supply. Voluntary export restraint or restriction (45) similar to a quota, but this time the limit on imports arises from a voluntary agreement (46) the exporting and importing countries. For example, the UK had an agreement with Japanese car (47) that they should not take (48) than 10 percent of the UK car market. Exchange control means that a government control on foreign currency controls importers access to foreign currency. This is a (49) which was used by a number of European countries, (50) the UK, in the 1960s and 1970s and is still found in some developing countries.

题型:单项选择题

( )水电站是世界上最大的水电站。

A.三峡

B.三门峡

C.葛洲坝

D.刘家峡

题型:单项选择题

下列药品的保存方法正确的是                              

A.氢氟酸保存在橡皮塞的细口玻璃瓶中

B.钠可封存于固态石蜡中

C.烧碱溶液放在磨口玻璃塞的试剂瓶中

D.氯水密封于无色的试剂瓶中

题型:单项选择题

下列溶液的pH最小的是

A.10%KOH

B.20%KOH

C.10%HCl

D.20%HCl

题型:单项选择题

在()中,根据中药、天然药物处方药说明书内容书写要求,列出处方中含有可能引起严重不良反应的成分或辅料。

A.【成分】

B.【功能主治】/【适应证】

C.【不良反应】

D.【注意事项】

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