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问题 多项选择题

每立方米的湿空气中所含水蒸气的质量称为（）；每千克质量的干空气中所混合的水蒸气的质量称为（）。

A、绝对湿度

B、相对湿度

C、含湿量

D、析水量

答案

参考答案：A,C

单项选择题

By using (26) , a 600M -byte music CD can be compressed to 50M bytes or less. It can be streamed (downloaded in chunks) so that you can begin listening to the opening bars while the (27) of the file arrives in the background. And, most important, the music files of this kind retain good listening (28) that earlier (29) schemes lacked. That (30) of features makes accessing and distributing music on the web practical for the first time.

A．compression

B．coding

C．transmission

D．playing
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单项选择题

该患儿诊断什么

A．高热惊厥
B．病毒性脑炎
C．癫痫
D．低血糖症
E．佝偻病手足搐搦症
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