题目内容
The metal used in concrete is called （）
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The corrosion resistance of steel may be enhenced in 3 ways, not including （）
The properties of metals which make them unique among constructional materials arethe（）、（）、（）
Metal consist of （）and （）
Plain carbon steel has good ductility and weldabllity if its carbon contest is （） and a high yield strength if its carbon content is（）.
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