A、2kN·m
B、4kN·m
C、<img width="33" height="23" src="http://admintk.100xuexi.com/UpLoadImage/2016-09-30/1a6b3d23-11cb-401c-aba6-57715bf56398.png" />kN·m
D、<img width="33" height="23" src="http://admintk.100xuexi.com/UpLoadImage/2016-09-30/9aa3d050-4c4a-4bd8-ab22-375403668e12.png" />kN·m
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