题目

一光滑大圆球固定在地上，O点为其球心，一根轻细绳跨在圆球上，绳的两端分别系有质量为m1和m2的小球（小球半径忽略不计），当它们处于平衡状态时，质量为m1的小球与O点的连线与竖直方向的夹角θ=60°，两小球的质量比m1：m2为（                                                                                  ）                                                                                                                                  　   A．   B．   C．   D．                                                                                                                                答案：D

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