GPRS/CDMA终端无法登录主站的可能原因是什么?如何进行检查?

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GPRS/CDMA终端无法登录主站的可能原因是什么?如何进行检查?

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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.

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已知两个相似三角形的周长比为2:3,它们的面积之差为30cm,那么它们的面积之和是(  )

A.74

B.76

C.78

D.80

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溴、碘单质在四氯化碳中的溶解度比在水中的溶解度大的原因是 [ ]

A.溴、碘单质和四氯化碳中都含有卤素

B.溴、碘是单质,四氯化碳是化合物

C.Cl2、Br2、I2和CCl4都是非极性分子,而水是极性分子

D.以上说明都不对

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看图漫画《学农夏令营》。回答问题。

漫画中的农业生产所属实践形式()

①是人类最基本的实践活动

②对社会的存在和发展起着决定作用

③决定着各种社会关系的形成和发展

④是历史前进的有力杠杆

A.②③④

B.①②③

C.①②④

D.①③④

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______对于售货员相当于仓库对于______。

A.商场 保洁员

B.家庭 父亲

C.市场 买菜人

D.商店 保管员

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