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【单选题】
假如已经定义了一个类student,现在要定义类derived,它是从student私有派生的,定义类derived的正确写法是()。A.
class derived::student private{.......};
B.
class derived::student public{.......};
C.
class derived:private student {.......};
D.
class derived:public student {.......};
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【单选题】[4.6][TC]一钢筋混凝土短柱,作用一轴向压力N 。过2年后卸去该轴向压力N ,则( )。
A.
柱截面中的纵向钢筋与混凝土的应力均为 0
B.
柱的长度可完全恢复到加荷前的长度
C.
柱截面中的纵向钢筋受拉而混凝土受压
D.
柱截面中的纵向钢筋受压而混凝土受拉
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