题目内容

盐浴炉可用三相或单相交流电，电极一般用（）制成的。

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强酸弱碱盐，其水溶液呈（）。

A. 酸性
B. 碱性
C. 中性

溶液的摩尔浓度是指（）。

A. 1mL溶液中所含溶质的摩尔数；
B. 10mL溶液中所含溶质的摩尔数；
C. 1升溶液中所含溶质的摩尔数；

偏差可以用测定值与其算术平均值之间的差值来表示。偏差可分为（）和（）两种。

For (1) service, we need a virtual-circuit subnet. Let us see how that works. The idea behind virtual circuits is to avoid having to choose a new (2) for every packet sent. Instead,when a connection is established, a route from the(3) machine to the destination machine is chosen as part of the connection setup and stored in tables inside the (4) . That route is used for all traffic flowing over the connection, exactly the same way that the telephone system works.When the connection is released, the virtual circuit is also terminated. With connection-oriented service, each packet carries an (5) telling which virtual circuit it belongs to.空白（5）处应选择（）

A. address
B. identifier
C. interface
D. element