题目

If what your friend comes up with surprises you，don't reject it immediately.________，imagine that it is true. A．Thus                         B．Besides C．Rather                       D．Otherwise 答案：C小明看到图中工人在推车，已知独轮车车斗和车内的煤受到总重力为900N，可视为作用于A点，车轴为支点O，工人将车把抬起时，作用在车把向上的力为多少N？