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问题 多项选择题

软件原型化开发方法有其基本步骤，下列（）是实施原型化的最基本步骤。

A、获得基本需求

B、开发工作模型

C、严格细致说明

C、模型验证

答案

参考答案：A, B, D

单项选择题

收缩蛋白的β链用限制性胰蛋白酶消化后，经SDS-PAGE分析显示()

A．2个肽段

B．3个肽段

C．4个肽段

D．5个肽段

E．6个肽段
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写作题

Dear Zhang Jing,

My grandpa 81____ going to Changchun next month, because he has heard a lot 82.______ the city and he would like 83.___ see it himself. He says the bus service in Changchun is very good now, and people can go anywhere 84.____ bus. Is he right? Can you tell me something more about it?

I hope to 85._____ from you soon.

Yours,

Tony
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