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【简答题】
在饮料自动销售系统中,顾客选择想要的饮料。系统提示需要投入的金额,顾客从机器的前端钱币口投入钱币,钱币到达钱币记录仪,记录仪更新自己的选择。正常时记录仪通知分配器分发饮料到机器前端。但可能饮料已售完,也可能用完了找给顾客的零钱而无法销售饮料。先写出“买到饮料”的场景、“饮料已售完”的场景以及“机器没有合适的零钱”的场景,然后根据场景用 UML 分别表示出“买到饮料”“饮料已售完 " 以及“无法找零”的顺序图。
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举一反三
【简答题】It is used to describe a frequency distribution which is not symmetrical and the left tail is stretched out longer than the right.
【简答题】It is a discrete probability distribution of the number of successes in a sequence of independent Bernoulli random experiments.
【单选题】Distribution center is an economic organization specialized in goods distribution activities. It is also a logistics node integrating processing, tally and ( ) functions.
A.
Purchase
B.
production
C.
sales
D.
delivery
【简答题】It is used to describe a frequency distribution which is not symmetrical and the right tail is stretched out longer than the left.
【判断题】Wal-Mart is well known for their progressive distribution systems. While distribution is important, it is not a marketing decision.
A.
正确
B.
错误
【简答题】It is a distribution that the area between negative 1.96 and positive 1.96 is 95%.
【单选题】If the expectation of a sampling distribution is located at the parameter it is estimating, then we call that sampling distribution
A.
unbiased.
B.
minimum variance.
C.
biased.
D.
random.
【简答题】It is a distribution similar to normal distribution, but it is not a normal distribution.
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