A.π/6
B.π/4
C.π/3
D.π/2
[单选题]A.π/6B.π/4C.π/3D.π/2
[问答题]
[判断题]对错A.对B.错
[单选题]A.0B.C.D.
[单选题]A.牙髓治疗B.观察不处理C.电活力测验D.X线片检查E.换其他盖髓剂