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單項(xiàng)選擇題

病毒的分離培養(yǎng)，常見的方法有

A、動(dòng)物接種
B、雞胚培養(yǎng)
C、細(xì)胞培養(yǎng)
D、血瓊脂平板
E、巧克力平板
F、厭氧培養(yǎng)基

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單項(xiàng)選擇題

下列人物中，與靖康之變無關(guān)的是（）

A.寇準(zhǔn)
B．李綱
C．宋徽宗
D．張邦昌

2.(1)To what events must the ticket-processing system respond? List each event, the type of event, the resulting use case, and the actor(s). Think carefully about who the actors are. Does the officer directly enter the ticket into the system? Or does a state patrol clerk do it when the paper ticket is received from the officer? The existing system uses paper forms, so for now assume the state patrol clerk enters all of the information. A new system would use the same use cases, but opportunities for efficiency and accuracy would lead to changes in who the actors are. (2)Write a brief use case description for each use case. (3)Draw a use case diagram for the ticket-processing system assuming the actors are based on your answers in question 1 (the existing system as described).

答案： A.(1)To respond to the following events, the ticket-processi...

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