表达式的值与运算符的种类、运算对象的数据类型有关。例如,表达式 2.5+5 的值的类型为______ 型。
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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