径向接触轴承为公称接触角大于0°～45°的向心轴承。
参考答案：错
水果批发市场有橘子480千克，苹果比橘子少25%，比梨多12.5%，水果批发市场有梨多少千克？
We should do such exercises in the future, I think, _____ we did yesterday.
A．as
B．for
C．about
D．than
