航空运费就是指运输始发地机场至目的地机场间的运输货物的航空费用，不包括其它费用。()
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The main concern of the passage is to______
A. advocate particular strategies for future efforts to organize certain workers into labor unions
B. explain differences in the unionized proportions of various groups of public-sector workers
C. evaluate the effectiveness of certain kinds of labor unions that represent public-sector workers
D. analyzed and explain an increase in unionization among a certain category of workers
E. describe and distinguish strategies appropriate to organizing different categories of workers
警察的社会性表现在它的社会管理职能上。()
A. 正确
B. 错误
According to the passage, which of the following is true of wages in southern cities in 1910？
A. They were being pushed lower as a result of increased competition.
B. They had begun t to rise so that southern industry could attract rural workers.
C. They had increased for skilled workers but decreased for unskilled workers.
D. They had increased in large southern cities but decreased in small southern cities.
E. They had increased in newly developed industries but decreased in the older trades.
能保护传动系统的机构安全，实现运距离平行轴传动的传动系统是()。
A. 链传动
B. 带传动
C. 齿轮传动
D. 摩擦轮传动
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