银合金粉中增加银含量将导致()
A.强度增加、膨胀减小
B.强度增加、膨胀增加
C.强度降低、膨胀减小
D.强度降低、膨胀减小
第4题
Which of the following promote microleakage ofamalgam( )
A.the micron-size gao that always exists between the amalgam and tooth structure
B.amalgam’s higher coeffiaient ofthermal expansion compared to that of tooth structure
C.use poor condensation technique
D.all ofthe above
请帮忙给出正确答案和分析,谢谢!
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