金属全冠制作完成后临床戴牙时颈缘崩瓷主要原因是
A.颈缘瓷层过厚B.颈缘瓷层过薄C.基底冠颈缘过长D.基底冠颈缘过短用瓷恢复长度E.基底冠颈缘过后
参考答案:B
在气相色谱法中,定性指标有()
A.保留时间
B.峰高
C.峰面积
D.保留体积
E.调整保留体积
从方框中选择合适的选项完成对话(其中有两项多余)。
A: What do you do on weekends?
B: 1
A: To the movies?
B: Yes. What about you?
A: 2
B: How often do you surf the Internet?
A: 3 It's very nice.
B: What do you do on the Internet?
A: I usually chat with my friends. 4
B: Yes. It's 43505891.
A: 5 We can talk on the Internet.