锅炉启动前,上锅筒上的空气阀应处于()状态。A、全开 B、半开 C、关闭 D、调整

题型:单项选择题

问题:

锅炉启动前,上锅筒上的空气阀应处于()状态。

A、全开

B、半开

C、关闭

D、调整

考点:热力司炉工考试初级热力司炉工初级热力司炉工题库
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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.

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某混合物A,含有Al2(SO4)3、Al2O3和Fe2O3,在一定条件下可实现下图所示的变化。

请回答下列问题。

(1)图中涉及分离溶液与沉淀的方法是__________________。

(2)B、C、D、E 4种物质的化学式为:B_________、C_________、D_________、E_________。

(3)沉淀F与NaOH溶液反应的离子方程式为__________________________________。

沉淀E与稀硫酸反应的离子方程式为__________________________________________。

溶液G与过量稀氨水反应的化学方程式为______________________________________。

题型:单项选择题

神经肌肉电刺激疗法适用于上运动神经元损伤疾患

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房产大修停用半年以上的,经纳税人申请,税务机关审核,在大修期间可免征房产税

题型:单项选择题

确诊慢性粒细胞白血病最有意义的依据是()

A.白细胞明显增高

B.中性粒细胞碱性磷酸酶活性降低

C.骨髓增生极度活跃

D.费城染色体阳性

E.脾肿大

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