单项选择题

The word radar is a/an（）.

A．acronym
B．initialism
C．clipping
D．blend

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单项选择题

Which five elements does lung belong to?

A． wood
B． water
C． fire
D． earth,
E． metal

The HTTP / 1.1 protocol works in a continuous, non-pipelined manner. One request-response time is one RTT. Assuming that a WEB page to be accessed refers to 4 JPEG small images, the web request starts until the browser receives all the content. The number of RTTs required is ( ).

答案： 5