根管治疗过程发生的并发症中，可能引起严重后果的是
A．急性根尖炎
B．急性根尖周炎
C．器械折断
D．侧壁穿刺
E．器械误吞误吸
参考答案：E
—Remember this, children. _______ you study, _______ knowledge you will get.
—We know, Mr. Green. [ ]
A. The harder, the less
B. The hard, the more
C. The harder, the more
D. harder, more
钻井液是一种复杂的胶体溶液。()
