试题与答案

如图一圆形截面,O点为它的形心.m-n线平行于z轴且将截面分成上下量个部分,两个部分

题型:单项选择题

题目:

如图一圆形截面,O点为它的形心.m-n线平行于z轴且将截面分成上下量个部分,两个部分的面积分别为A1、A2,对z轴的静矩分别为Sz1、Sz2则()。

 

A.Sz1+Sz2=0

B.Sz1+Sz2<0

C.Sz1+Sz2>0

D.不能确定

答案:

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