用力将重物竖直提起，先是从静止开始匀加速上升，紧接着匀速上升，如

果前后两过程的时间相同，不计空气阻力，则[　　　 ]

A．加速过程中拉力的功一定比匀速过程中拉力的功大

B．匀速过程中拉力的功比加速过程中拉力的功大

C．两过程中拉力的功一样大

D．上述三种情况都有可能

The information regarding ports such as buoyed channels,fairway,location and number of terminals,river channels,details of navigational marks,location of overhead bridges, underground cables etc. are shown in（）

A.small-scale charts

B.medium-scale charts

C.large-scale charts

D.natural scale charts