有一自动饮料售货机系统,其要求的功能如下:顾客买饮料;供应商向自动饮料售货机添加饮料;收银员,从自动饮料售货机中收钱。供应商和收银员在使用自动饮料售货机时,均可打开和关闭该机器。请根据需求,画出它们的用况图。
答: 【答案解析】:P103 答: 【答案解析】:P103
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上一篇:Complete the following sentence with a (compound) word derived from the one(s) given in bracket.He was very ( ) at cards; so far he has lost ten thousand yuan.(luck)
Complete the following sentence with a (compound) word derived from the one(s) given in bracket.
He was very ( ) at cards; so far he has lost ten thousand yuan.(luck)
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