在机械传动中，V带（三角带）传动通常应放在传动的低速级。

原文：W: I’m in chrge of buying the fruit for the childrent our church. I’m so hppy to find thtpplesnd grpesre in seson. Give me two dozens of ech. M: I hope tht they’res goods they look. How mnypples will she buy 8. B．12. C．36. D．24.A．8．B．12．C．36．D．24．