题目内容
（请给出正确答案）
Traversing a binary tree in preorder is equivalent to(68).
A．Traversing the forest corresponding to the binary tree in root-first order
B．Traversing the forest corresponding to the binary tree in root-last order
C．Traversing the forest corresponding to the binary tree in breadth-first order
D．None of the above
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A、1234
B、2341
C、3241
D、4321
B．postorder
C．reorder
D．inorder
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A．类S的对象可以访问F1，但不能访问F2
B．类S的对象可以访问F2，但不能访问F1
C．类S的对象既可以访问F1，也可以访问F2
D．类S的对象既不能访问F1，也不能访问F2
A．链接
B．输出重定向
C．管道
D．输入重定向
B．Sale_record(员工号，名称，商品号，数量)
C．Sale_record(员工号，部门号，数量)
D．Sale_record(员工号，部门号，商品号，数量)
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