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【单选题】
可摘局部义齿的固位力主要来自（）A.
卡环的卡抱力
B.
义齿部件与间形成的摩擦力
C.
义齿本身的重力
D.
基牙间相互的制约力
E.
吸附力及间接固位体的平衡力
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【单选题】—I have won the first prize in the English competition. —________________
A.
I’m happy.
B.
Not bad.
C.
Congratulations.
D.
I can’t believe it.
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