单项选择题

ISO 9000系列标准和软件成熟度模型CMM都着眼于质量和过程管理。ISO9000系列标准的主导思想是：
①强调质量(1)；
②使影响产品质量的全部因素始终处于(2)状态；
③要求证实企业具有持续提供符合要求产品的(3)；
④强调质量管理必须坚持进行质量(4)，而CMM则强调持续的(5)。

A.形成于软件需求
B．形成于软件设计
C．形成于软件实现
D．形成于生产的全过程

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单项选择题

Packet-switching wireless networks are preferable(41)when transmissions are(42)because of the way charges are(43)per packet. Circuit-switched networks are preferable for transferring large files or for other lengthy transmissions because customers are(44)for the(45)of time they use the net-work.

A．to
B．for
C．than
D．only

单项选择题

For each blank, choose the best answer from the four choices and write down on the answer sheet.(11)is a protocol that a host uses to inform. a router when it joins Or leaves an Internet multicast group.(12)is an error detection code that most data communication networks use.(13)is an interior gateway protocol that uses a distance vector algorithm to propagate routing information.(14)is a transfer mode in which all types of information are organized into fixed form. cells on an asynchronous or non-periodic basis over a range of media.(15)is an identifier of a web page.

A．ICMP
B．SMTP
C．IGMP
D．ARP

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