问题：
[填空题]系统结构设计的基本步骤为：需求分析、_________、_________、_________反复进行设计优化和评价。
参考答案：
需求说明，概念性设计，具体设计
相关内容
- ● By no mean ______ detroy or create energy.
- ● Ak Mr. Brown, or any other peron ______.
- ● Our ucce _______ whether everyone work hard or not.( )
- ● Morning or afternoon. It make no _______ to me.
- ● Which ________ do you prefer, coffee or orange juice?
- ● Baically a robot i a machine which move, manipulate, join or procee _____in the ame way a human hand or arm.
- ● Table______ of tone or wood.
- ● Without water, _________ no plant or animal.
- ● Now almot all the parent want their children to learn the piano or the violin, _____ their children are willing or not.( )
- ● I am wondering if they are ____ or____.
- ● _________ in a peron’ peech or writing uually range on a continuum from caual or colloquial to formal or polite according to the type of communicative ituation.
- ● __________ i the act performed by or reulting from aying omething; it i the conequence of, or the change brought about by the utterance.
