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多项选择题
A.S->top=p;
B.p->next=S->top;S->top=p;
C.p->next=S->top;S->top=p->next;
D.p=S->top;S->top=p;
多项选择题
A.p=S->top;S->top=p->next;
B.p=S->top;S->top=p;
C.p=S;S->top=p->next;
D.p=S->top;S->top=p->next->next;
多项选择题
A.a,b,c,d,e
B.e,d,c,b,a
C.c,b,a,d,e
D.d,b,c,a,e