题目内容
YB55型小盒透明纸包装机为保证拉线在牵引过程中不至于（）过大而影响包装质量，测速传感器根据张紧装置摆臂的摆动幅度来调节直流电机的速度。
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Exports are either raw materials or manufactured goods. Raw materials are products of the land， such as cotton， timber or rubber. Some raw materials， such as iron ore， come from mines. These raw materials are often exported by the countries that produce them to other countries where they are made into manufactured goods. Some countries produce food for export， for example， meat， sugar， or cereals such as wheat and maize. These countries are agricultural countries. An agricultural country needs fertile land and a good climate. A cold， dry climate is not suitable for agriculture. A country which produces manufactured goods is known as an industrialized country. An industrialized country cannot always produce enough food for its own needs. In this case， it does not export foodstuffs. Instead it has to import them. It relies on exports of manufactured products and pays for imports with the money it earns from the exported goods. Raw materials are often exported by the countries that produce them to other countries where（）.
声望定价策略属于（）。
根据《建设工程安全生产管理条例》规定，以下不属于列入建设工程概算的安全生产所需资金的项目是（）。
采煤机滚筒转速一般为（）
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