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为控制油松毛虫的严重发生，应大力提倡营造（）。
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Quotas , tariffs and subsidies Like most wars,a trade war may bring about desired economic or political changes, but in the long run almost everyone suffers ,including those whom the trade war was meant to help. An efficient carmaker, for example, may ask for limits of foreign imports, hoping to keep its price high without improving the quality of its products. In the end , however , other countries may retaliate with trade restrictions of their own. Consumers and businesses in both countries are then forced to buy poorly made and expensive domestic products. Trade restrictions might protect a few jobs in inefficient industries,but the whole economy often suffers by becoming less competitive in the international markets. The most common tools for limiting imports of foreign goods and services are quotas, tariffs,and subsidies. When a country imposes a quota, it limits the quantity of certain foreign products that can be imported. A tariff is a tax placed on goods entering a country , raising the price of imported goods. A government can also use the taxpayers' money to provide a subsidy to local producers , making the price of local goods artificially lower than imported goods. Trade barriers, like walls between feuding neighbors, are usually imposed unilaterally by one country acting on its own to limit the amount of foreign products available to local producer from foreign competition and allow them time to improve their products or lower their prices as long as they are protected from foreign competition by trade barriers. Although trade restrictions are of dubious economic value, they have been shown to be effective in bringing about political or social change. The refusal of countries to trade and do business with South Africa, for example, was widely seen to be responsible for the decision to dismantle the system of apartheid. Trade blockades can be useful in forcing countries to change policies that violate human rights or international treaties, but as long as a sufficient number of countries join in the blockade to make it effective. Questions for reading :
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工作面在回采前必须编制（）。
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下列各项收支中影响企业营业利润的是（）。
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四个样本率作比较，x2>x20.01（3），可以认为：（）
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轨道车车辆的轴位是：制动缸活塞杆伸出的方向为前方，所对的转向架为第（）转向架，其前轴为第一轴，后轴为第（）轴，另一转向架为第（）转向架，其前轴为第（）轴，后轴为第（）轴。
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（）区域协调机构分为综合功能的协调机构与单一功能的协调机构两种类型。
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原发性醛固酮增多症的诊断标准包括（）。
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我国哪一个省级行政单位批毗临的省区最多？
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某设区市内有一企业的入海排污口经科学论证后拟报请审查批准。依据《中华人民共和国海洋环境保护法》，对该排污口有审批权的是（）。