会计职业道德重在确认会计人员的职业权利。 ( )
参考答案：错
Not only Jim but also his parents ______ a few places of interest since they came to China.
A．has visited
B．will visit
C．have visited
D．visited
如图所示，定滑轮重4N，动滑轮重2N．物体A在拉力F的作用下，1s内将重为8N的物体A沿竖直方向匀速提高了0.2m．如果不计绳重和摩擦，则滑轮组的机械效率为______，拉力F的功率为______W．
