题目内容
Boston has one of the largest populations and its famous sights include the Statue of Liberty, the Empire State Building, etc.
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A budget hotel or motel is a popular option for travelers in the Asian countries.
The Bronx is generally a poor district with many immigrant families and African Americans, and Hispanic Americans.
( ）是用内、外螺纹组成的螺旋副来传递运动和动力的装置。它主要用来将回转运动变为直线运动，同时传递运动和动力。
下列有关螺旋传动机构的论述中，正确的是（ ）。
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