55. The present situation in about half of the states is that the graduated licensing system .
A. is under discussion
B. is about to be set up
C. has been put into effect
D. has been perfected
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金属基底的厚度，非贵金属至少保证（）mm
A. 0.1mm
B. 0.2mm
C. 0.3mm
D. 0.4mm
E. 0.5mm
金―瓷结合部应避免设计在
A. 咬合接触区
B. 非咬合接触区
C. 颊侧
D. 舌侧
E. 颈部
金瓷结合线的伸展位置
A. 颈1/3处
B. 邻面1/3与中1/3交界处。
C. 邻面1/3与中1/2交界处。
D. 舌侧
以获得和交单为两个结点，可以将外贸分为，和三个阶段。
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