牙体预备时，为减小对牙髓的损害所采取的措施是
A．水雾冷却B．间歇切割C．短时切割D．轻压磨切E．以上都对
参考答案：E
I was about to give up when a good idea _____ upon my mind. [ ]
A. hit
B. struck
C. flashed
D. happened
能否建设一支精干高效的营销队伍，是决定会展企业营销工作成败的关键环节。
