试述医疗设备全寿命费用分析的方法。

With the final examination ________, we are busy going over what we've learnt this term.[ ]

A. is approaching

B. has approached

C. approached

D. approaching

重链具有5个功能区的Ig分子是()

A．IgG

B．IgA

C．IgM

D．IgD

E．IgE

—Dad, must I do my homework now?

—No. You_____play games with your friends for a little while.

A．would 　　

B．needn’t

C．may

D．don’t have to

将下列句子排序，组成一段完整的对话。

A. Yes,please.1 want a hat.

B. Thirty dollars.

C. What color do you want?

D. How much is it?

E. You're welcome.

F. Can I help you?

G. Black and white.

H. I'll take it. Thank you.

I. Here you are.

正确顺序是: __________________________

软件设计包含过程设计、接口设计、体系结构设计和数据设计，其中最后完成的设计是______。

A．过程设计

B．接口设计

C．体系结构设计

D．数据设计