Most composite materials consist of a selected（）or reinforcing material and a compatible resin（）to obtain the specific characteristics and properties desired.
正确答案：filler binder
Most composite materials consist of a selected（）or reinforcing material and a compatible resin（）to obtain the specific character
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Usually, the composites do not（）in each other, and they can be physically identified by an interface between them.
Metals are commonly divided into two classes:（）metal and（）metals.
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