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【单选题】
关于平衡式变幅系统的描述正确的是:( )A.
活动对重杠杆系统是为了实现物品的近似水平移动
B.
刚性四连杆组合臂架系统是为了实现物品的近似水平移动
C.
刚性四连杆组合臂架系统是为了实现臂架系统的重心近似走直线
D.
以上描述都是错误的
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