发包人收到竣工验收报告后( )天内,组织有关部门验收,并在验收后( )天内,给予认可或提出修改意见。
A.30:15
B.28:14
C.20:10
D.14:7
参考答案:B
His mother, with his aunt ____ now.
A.are doing shopping
B.is doing shopping
C.do shopping
D.does shopping
若带头结点的单链表的头指针为head,则判断链表是否为空的条件是( )
A.head=NULL
B.head->next=NULL
C.head!=NULL
D.head->next!=head