单项选择题
A. typedef struct B. struct REC; int n;char c;REC; int n;char c;; REC t1,t2; REC t1,t2; C. typedef struct REC; D. struct int n=0;char c='A';t1,t2; int n;char c;REC; REC t1,t2;
A. p->next=q->next; B. p->next=p->next->next; C. p->next=r; D. p=q->next;
A. struct ordint x; int y; int z;; struct ord a; B. struct ordint x; int y; int z; struct ord a; C. struct ordint x; int y; int z; a; D. structint x; int y; int z; a;