下列各个装置中铁棒被腐蚀由易到难的顺序正确的是( ) A.③①②④ B.④①③

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问题:

下列各个装置中铁棒被腐蚀由易到难的顺序正确的是(  )

A.③①②④

B.④①③②

C.①③②④

D.②④①③

考点:金属的电化学腐蚀金属的化学腐蚀金属的电化学防护金属的表面防护
题型:选择题


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:选择题

从航运部门的角度出发,净空高度是指跨河架空建筑物的下缘最低点至()垂直距离。

A、绝对寒水位置

B、设计最高通航水位面

C、最高水位面

D、当地零水位面

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如图所示,小明家的四种家用电器,其中额定功率最接近1000W的是: 

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热淋,小便淋漓涩痛,兼见心烦尿赤,口舌生疮,首选的药物是()

A.茵陈

B.滑石

C.茯苓

D.萆薢

E.木通

题型:选择题

读图“地壳物质循环略图”,完成下列各题。

经变质作用而形成的岩石是()

A.a

B.b

C.c

D.d

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