A、<img width="61" height="24" src="http://admintk.100xuexi.com/UpLoadImage/2016-10-26/bf23cbab-724a-4cc4-8d97-88cf569ad7be.png" />
B、<img width="88" height="24" src="http://admintk.100xuexi.com/UpLoadImage/2016-10-26/ca7b8f68-ef5d-4ab1-8c92-d1239e114383.png" />
C、<img width="69" height="24" src="http://admintk.100xuexi.com/UpLoadImage/2016-10-26/4c46d730-ce9b-4c3c-b6b7-7c7d5a479360.png" />
D、<img width="68" height="24" src="http://admintk.100xuexi.com/UpLoadImage/2016-10-26/01d2556c-cd04-4140-b2ff-56fdbb820bc3.png" />
查看答案
，则欲使系统保持平衡，作用在CD杆上力偶的矩
的转向如图所示，其矩值为（ ）。
题49图