问题
单项选择题
卡环臂在基牙上的位置
A．取决于导线并随牙冠形态而异，一般是舌臂高颊臂底
B．主要取决于导线与牙冠形态无关
C．取决于导线并不需随牙冠形态而异，一般都是舌、颊臂等高
D．取决于牙冠形态与导线无关
E．以上都不是
答案
参考答案：A
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卡环臂在基牙上的位置
A．取决于导线并随牙冠形态而异，一般是舌臂高颊臂底
B．主要取决于导线与牙冠形态无关
C．取决于导线并不需随牙冠形态而异，一般都是舌、颊臂等高
D．取决于牙冠形态与导线无关
E．以上都不是
参考答案：A
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