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串函数StrCmp（“d”，“D”）的值为（）。
HXD1型电力机车激活定速模式应完全满足：主司控器在“牵引”区域，它不在“零”位或者“制动”区域；（）。
通信局的基础电源分交流基础电源和（）两大类。
采用（）时，对典型定额的选择必须恰当，通常采用主要项目和常用项目作为典型定额比较类推。
Free trade is an economic policy under which the government does not interfere with trade. No tariffs are applied to imports or exports, and people are allowed to trade goods and services as they please. Supply and demand dictates the prices for which goods and services sell and are the only factors that determine how resources are allocated in society. Under a free trade system, there are no trade barriers. There is free access to markets and market information, and there are no government-imposed monopolies. The following are opinions from both sides. Read the excerpt carefully and write your response in about 300 words, in which you should: 1. summarize briefly the opinions from both sides, and then 2. give your comment. Marks will be awarded for content relevance, content sufficiency, organization and language quality. Failure to follow the above instructions may result in a loss of marks. Those who support free trade believe that it allows companies to come by raw materials and lower prices, which, in turn, results in lower prices on the open market. Supporters also believe that the levels of employment in a nation are determined by the monetary policy of that nation and not the trade policy. Additionally, when people must compete for a profit, they produce better products and are more motivated to increase their education and knowledge because these increases come with personal benefits. On the contrary, many believe that the government should dictate prices and impose more taxes on imports and exports. Critics often believe that many outsourced jobs are a result of free trade practices; and regulating trade could keep companies from finding cheaper labor and lower cost overseas. There are also concerns with the social burden of limited job security if companies put too much effort into looking for cheaper labor and lower cost. Critics feel that this results in a more worried, cautious public that is less likely to spend and invest in the economy. This is certainly not an advantage when the world economy is already in recession.
胎儿视为具有民事权利能力，但胎儿出生时未存活的，其民事权利能力自始不存在。
下列生态系统中，初级生产力最高的是（）
为避免电流互感器二次短路的危险，其二次回路中应装有熔断器。
机械搅拌通风发酵罐高度与直径之比一般为（）氧的利用率较高。
SNMP协议是网管系统用来管理网络设备时常用的协议，到目前为止已经有（）个版本。
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