冷轧厂1780机组轧机支撑辊直径()mm;工作辊直径()mm 。
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Patients should not function on crownsjust after cementation ofthe crowns with a chemically-activated resin cement because()
A. the tooth will be sensitive
B. the bond needs time to mature
C. the crown may fracture
D. the cement shade will change drastically
冷轧板的锈蚀跟()无关。
A. 下雨天气潮湿
B. 乳化液中Cl-含量高
C. 欠酸洗
D. 平整液吹扫不净
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