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请找到C语言运算符的优先级和结合性的含义。

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The ferrous metals are mainly made from （）

A. iron
B. copper
C. alluminium
D. alloy

The metal used in concrete is called （）

A. wrought steel
B. structural steel
C. reinforcement
D. hot-rolled steel

The corrosion resistance of steel may be enhenced in 3 ways, not including （）

A. protective coatings of paints
B. thermally treated
C. cathodic protection
D. alloyed steel

The properties of metals which make them unique among constructional materials arethe（）、（）、（）