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问题 多项选择题

DS6—11型计算机联锁控制系统是分布式多微机处理系统，它主要由下列哪些子系统组成（）

A、控制台子系统

B、联锁子系统

C、监测子系统

D、输入/输出接口

答案

参考答案：A, B, C, D

单项选择题 共用题干题

 A glue that holds the whole Internet together is the network layer protocol, (71)．Unlike most older network layer protocols, it was designed from the beginning with internetworking in mind．Its job is to provide a (72) way to transport datagrams from source to destination，without regard to whether these machines are on the same network or whether there are other networks in between them． Communication in the Internet works as follows．The (73) layer takes data streams and breaks them up into datagrams．Each datagram is transmitted through the Internet, possibly being fragmented into smaller units as it goes．When all the pieces finally get to the destination machine, they are reassembled by the (74) layer into the original datagram．This datagram is then handed to the transport layer, which inserts it into the receiving process’ input stream． An IP datagram consists of a header part and a text part．The header has a (75) part and a variable length optional part．

空白处（75）应选择（）

A.40-byte fixed

B.64-byte fixed

C.20~64 bytes variable

D.20-byte fixed
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单项选择题

关于DDD的正确说法是

A．DDD值包括病程的不同时期的用药剂量
B．不同国家人群的DDD值都是相同的
C．DDD值也适用于儿童的药物利用研究
D．DDD是推荐给临床的实用剂量
E．DDD是测量药物利用的单位
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