题目内容
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Which is the most stiffest material？![Which is the most stiffest material？ [图]A、AB、BC、C.](http://static.jiandati.com/3ed6449-chaoxing2016-1011704.png)
A、A
B、B
C、C
D、none
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Which is the most ductile material?
A、A
B、B
C、C
D、none
A、Brinell
B、Rockwell
C、Vickers
D、none of them
Which is the most like steel?
A、A
B、B
C、C
D、none
A、Charpy test
B、Brinell test
C、Tensile test
D、Izod test
Which is the most like cast iron?
A、A
B、B
C、C
D、none
A、Increase the degree of supercooling（过冷度）
B、Inoculation孕育处理
C、Vibration, stirring振动、搅拌
D、Reduce the degree of supercooling
A、Point Defects
B、Line Defects
C、Planar Defects
D、none of them
A、Solid Solutions固溶体
B、Metallic Compounds金属化合物
C、Mixtures混合物
D、none of them
A、copper
B、CO
C、solder焊锡
D、steel
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