题目内容
关于卡环固位力与固位臂的关系，正确的描 述是
2021-11-15
A.卡环臂越长，固位力越大
B.卡环臂越长，固位力越小
C.卡环臂越粗，固位力越小
D.卡环臂越细，固位力越大
E.卡环臂横断面为圆形比半圆形固位力大
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