RPI卡环采用近中支托的主要目的是
A．防止基托下沉
B．减少牙槽嵴受力
C．减少基牙所受扭力
D．增强义齿稳定
E．防止食物嵌塞
参考答案：C
—My cousin would like to risk _____ the weight-loss pills rather than _____ in a gym.
—Really? She must be mad.
A．to take; work out.
B．to take; working out.
C．taking; working out.
D．taking; work out.
（）必须为从事危险作业的职工办理意外伤害保险并支付保险费。
A.建设单位
B.监理单位
C.施工单位
D.设计单位
