单项选择题

图示截面图形，D>>d，对形心轴z的惯性矩Iz的值为（）。
A、
B、
C、
D、

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3. Generally in their lives college graduates earn ______ those with only a secondary school education.
A、twice as much as
B、three times as much as
C、a little more than
D、just the same as 无解析