A.
B.
C.
D.
E.以上均不正确
[单选题]( ).A.B.C.D.
[单选题]A.B.C.D.E.以上均不正确
[问答题]a=____________,b=___________,c=__________,d=____________.
[单选题]A.B.C.D.
[单选题]A.铸造全冠B.树脂充填C.烤瓷全冠D.E.银汞充填