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问题 选择题

同温同压下，1mol O2和36.5g HCl气体的体积相比，前者和后者的大小关系是（　　）

A．大于

B．等于

C．小于

D．不能肯定

答案

n（HCl）=

36.5g
36.5/mol
=1mol，

则：n（O2）=n（HCl），

根据阿伏加德罗定律可知，同温同压下，气体的气体摩尔体积相同，相同物质的量的任何气体的体积相同，

故选B．

单项选择题

A transport layer protocol has several responsibilities. One is to create a process-to-process (program-to-program) communication, TCP uses port (1) to accomplish this. Another responsibility of a transport layer protocolis to create a  (2) and error-control mechanism at the transport level. TCP uses a sliding(3) protocol to achieve flow control. It uses the acknowledgment packet, time-out, and retransmission to achieve(4) control. The transport layer is also responsible for providing a connection mechanism for the application program. The application program sends  (5) of data to the transport layer. It is the responsibility of the transport layer at the sending station to make a connection with the receiver.

空白（3）处应选择（）

A.path

B.window

C.frame

D.diagram
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单项选择题

煤粉越细（）越大，煤粉燃烧速度就快，燃烧率可以提高。

A、喷吹量

B、杂质量

C、固定碳

D、比表面积
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