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为了维持药物的良好疗效应( ) A．增加给药次数 B．减少给药次数 C．增加药物剂量 D．首剂加倍 E．根据半衰期确定给药时间
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N/O分析仪采用（）坩锅熔样。
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关于未成熟畸胎瘤哪个描述不对()
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生态学（Ecology）一词是在那一年中第一次提出的（）
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何谓内氧化？在试样边缘有何特征？
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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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联合国国际法委员会编纂的国际公约草案的通过应交由（）
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鼻腔的副交感神经来自()
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试述同步的概念及其对通信质量的影响。
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用牙挺取位于牙槽窝内的断面一侧高，一侧低的牙根时牙挺插入的位置应该是（）