A.开髓孔不充分
B.器械跳号使用
C.器械反复使用变形
D.预备过程未能及时充分冲洗
E.根管形态变异
第7题
A、You tell a friend the contents of this MOOC.
B、Bill obeys the orders of the officer during the military training (军训).
C、Lisa tosses a coin to decide whether she should choose to work in Beijing or Shanghai.
D、Mary shops online according to the ratings.
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