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问题 单项选择题

商品资本的特点有 ( )

A．是资本循环的一种职能形式

B．执行在生产过程中生产出商品的职能

C．是指具有一定商品属性的商品

D．一切商品都表现为商品资本

答案

参考答案：A

解析：[注释] 商品资本是以商品的形式存在的资本，是资本循杯的一种职能形式，所以不选C；执行在生产过程中生产出商品职能的是生产资本，不是商品资本，所以不选B；并不是一切商品都表现为商品资本，所以不选D。因此，正确选项为A。

填空题

用胎心听诊器或胎心多普勒听诊胎心音时应注意与（）、（）及脐带杂音相鉴别。
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单项选择题

A transport layer protocol usually has several responsibilities．One is to create a process-to-process communication；UDP uses (1) numbers to accomplish this．Another responsibility is to provide control mechanisms at the transport level．UDP does this task at a very minimal level．There is no flow control mechanism and there is no(2) for received packet．UDP, however, does provide error control to some extent．If UDP detects an error in the received packet，it will silently drop it． The transport layer also provides a connection mechanism for the processes．The (3) must be able to send streams of data to the transport layer．It is the responsibility of the transport layer at (4) station to make the connection with the receiver, chop the stream into transportable units，number them，and send them one by one．It is the responsibility of the transport layer at the receiving end to wait until all the different units belonging to the same process have arrived，check and pass those that are (5) free, and deliver them to the receiving process as a stream．

（3）处应填（）。

A．jobs

B．processes

C．programs

D．users
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