F因子转移时，一般采用（）模型进行复制。

阅读下面材料，在空白处填入适当的内容（不多于3个单词）或括号内单词的正确形式。

David: Have you made up your mind  小题1: to go for your holiday, Jane?

Jane: We  小题2:  (go) to Florida.

David: Great! Florida has always been one of the world’s most popular tourist      小题3:    (attract). Oh, by the way, how long are you going to stay there?

Jane: One week.

David: Have you got any friends there?

Jane: No. I have always wanted to go,    小题4:  I’ve been too busy to afford the time. Now I’ve got a week’s holiday, and I can enjoy Christmas special prices. My dream will come true.

David: Lovely! I guess you will    小题5: (certain) go to Disneyland.

Jane: You are right. You have been there, right?

David: Yes, I went there last year. And I’m looking forward    小题6:  going there a second time.

Jane: Tell me something about it, will you?

David:  The park,    小题7:  is often called a “Magic Kingdom”,   小题8:  (make) up of several main sections. They are named Main Street, Frontier Land, Fantasy Land, Tomorrow land and Adventure Land. There are so many things    小题9: (see) in the park.

Jane: It must have been 小题10:  unforgettable experience for you.

David: That’s true. I’m sure you’ll enjoy your visit.

Jane: Thank you. I believe so.

找出这辆故障车有哪种违法行为？（）

A．没有设置警告标志

B．没有开启危险报警闪光灯

C．没有将车停到路边

D．没有立即排除故障

在 Visual Basic中，要将一个窗体从内存中释放，应使用的语句是

A．Hide

B．Unload

C．Load

D．Show

质量管理的首要环节是( )。

A．计划
B．实施
C．检查
D．处理

硝态氮肥有哪些共同特点？