多项选择题

关于抽油机上的四连杆机构，以下说法正确的是：

A．作用是将旋转运动转化为往复运动
B．该机构的四根杆都是活动的
C．游梁支点与曲柄轴之间的连线是该机构一根“虚拟杆”
D．每分钟曲柄旋转次数与每分钟悬点的往复次数相同

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Shaolin School is feminine while Wudang School is masculine.

答案：错误

单项选择题

We can use hand or arm movement to indicate change of intonation as if conducting music. When is necessary to mark intonation, we often use rising or falling arrows, such as↗ and↘.
A、正确
B、错误