计算:(-37)2=______;36×9=______.

题型:填空题

问题:

计算:(-3
7
)2
=______;
36×9
=______.
考点:二次根式的乘除
题型:填空题


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:填空题

Edward, you play so well. But I ______ you played the piano.

A.didn’t know

B.hadn’t known

C.don’t know

D.haven’t known

题型:填空题

产品性能试验主要包括()。

A、湿热试验

B、功能试验

C、负载试验

D、空运转试验

题型:填空题

以下哪一项为猫眼疮的特点( )

A.群集水疱,环状排列,剧烈瘙痒
B.皮损为暗红、淡紫色或皮肤色多角形扁平丘疹
C.好发于肢端,黏膜无损害,红斑浸润显著
D.皮损多形性,具有虹膜样特征性红斑
E.皮损呈多形性,对称发作,反复发作易转为慢性

题型:填空题

DGS8800e数字调速系统控制面板左上方给出了六种运行模式,其中试验模式的功能是用于判别故障,可判别的故障包括()。

A.运行故障

B.车令发讯装置故障

C.停车故障

D.报警器故障

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