第2题
Brittle materials have which of the following characteristics( )
A.they undergo a lot of permanent deformation before fracturing
B.they tend to have a very ordered atomic structure
C.they respond poorly to tensile forces
D.A and B
此题为多项选择题。请帮忙给出正确答案和分析,谢谢!
第4题
A dentist adjusts the shade ofa restoration using a complementary color.This procedure will result in( )
A.increased value
B.decreased value
C.intensified color
D.increased translucency
请帮忙给出正确答案和分析,谢谢!
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