The noble or precious metals are a group of（）elements that have some physical characteristics in common.
A.six
B.seven
C.eight
D.nine
正确答案：eight
The noble or precious metals are a group of（）elements that have some physical characteristics in common.
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For most cast irons the carbon exists as（）
The（）steels are hardest, strongest, and yet least ductile of the carbon steels， and wear resistant and capable of holding a shar
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