第2题
Syneresis refers to( )
A.the expansion ofa hydrocolloid impression material when it takes in water
B.the contraction of a hydrocolloid impression material when it exudes water
C.the fact that the sol and gel temperatures ofthe hydrocolloid differ
D.the inclusion ofpowder in a hydrocolloid impression material
请帮忙给出正确答案和分析,谢谢!
第3题
Which of the following impression materials set by physical means( )
A.agar
B.ZOE
C.alginate
D.addition silicone
请帮忙给出正确答案和分析,谢谢!
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