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问题 单项选择题

价值工程中的全寿命周期费用是指()。

A.生产过程发生的全部成本 

B.从开始使用至报废过程中发生的费用总和 

C.产品存续期的总成本 

D.生产费用、使用费用及维护费用之和

答案

参考答案：D

解析：产品寿命周期成本由生产成本和使用及维护成本组成。

单项选择题

Each machine supporting TCP has a TCP transport entity, either a library procedure, a user process, or part of the kernel. In all case, it manages TCP streams and（）to the IP layer. A TCP（）accepts user data streams from local process, breaks them into pieces not exceeding 64KB, and sends each piece as a separate IP（）. When datagrams containing TCP data arrive at a machine, they are given to the TCP entity, which reconstructs the original byte streams.

The IP layer gives no guarantee that datagrams will be delivered properly, so it is up to TCP to time out and（）them as need be. Datagmms do arrive may well do so in the wrong order, it is also up to TCP to（）them into messages in the proper sequence.

A TCP（）accepts user data streams from local process.

A．connection

B．file

C．entity

D．destination
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多项选择题 X型题

关于嗜麦芽窄食单胞菌的鉴定要点，正确的是（）

A.氧化酶阳性

B.麦芽糖氧化

C.水解七叶苷

D.液化明胶

E.DNA酶阳性
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