过盈连接的配合面间产生压力，工作时依靠此压力产生（）力来传递转矩和（）力。
参考答案：摩擦；轴向
24°45′的余角为______°______′．
．—Has your father finished his report?
—Sorry，I don’t know．He ________ it this morning．
A．was writing
B．wrote
C．has written
D．had written
