在单链表中,指针p所指元素为x的结点,实现删除x的后继的语句是( )。
A. p=p->next;
B. P->next=p->next->next;
C. P->next=p;
D. P=p->next->next;
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(1) The teacher always ___________us to study hard for our future.(2) We should ___________the love of our relatives and friends.(3) As a new-century college student, we should be_____________for ourselves.(4)_________ is always in our hand, so we should work hard.(5) They carefully __________their friendship from being hurt.
下列哪些病毒能引起马铃薯病毒病_____。
A. TMV
B. CMV
C. PVY
D. PVA
马铃薯病毒的防治策略是_____。
A. 防治蚜虫,加强栽培管理
B. 经常性换种
C. 以药剂防治为主
D. 生产和使用无毒种薯
马铃薯病毒病的防治策略应以采用无毒种薯为主,结合选用抗病品种及治虫防病等综合防治措施。
A. 对
B. 错