V带传动的特点是()。
A、具有恒定的传动比
B、可实现过载打滑保护
C、传动距离较长
D、布置方便造价便宜
E、可实现无级变速
参考答案:B, C, D, E
(二)
当该建设项目的产量为13000件时,利润为( )万元。
A.100
B.118
C.120
D.136
The income of skilled workers went up. ________, unskilled workers saw their earnings fall.
A.Moreover
B.Therefore
C.Meanwhile
D.Otherwise