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【简答题】
有一 R22 系统,为了降低压缩机的排气温度,将一部分冷凝液体经节流后进入压缩机吸气管(如图 所示),设循环的冷凝温度为 t k 、蒸发温度为 t o ,制冷剂在蒸发器与冷凝器出口、压缩机吸入口均为饱和状态,试证明该循环的制冷系数等于采用相同制冷剂 R22 且蒸发温度为 t o 、冷凝温度为 t k 的基本理论制冷循环的制冷系数。并画出该循环的压焓示意图。
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【单选题】适宜病人休养的环境是
A.
气管切开病人,室内相对湿度为30%
B.
中暑病人,室温应保持在4℃左右
C.
普通病室,室温以18~22℃为宜
D.
产妇休养室,须保暖不宜开窗
E.
破伤风病人,室内应保持光线充足
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A.
一般病室的温度保持在 16℃为宜
B.
新生儿病室,室温宜在 22~24℃
C.
产休室不宜开窗
D.
破伤风病人,室内光线要明亮
E.
气管切开病人,室内相对湿度为 40%
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A.
in
B.
with
C.
among
D.
by
【简答题】阅读理解。 My newly-rented small apartment was far away from the centre of London and it was becoming essential for me to find a job, so finally I spent a whole morning getting to town and putting my name ...
【简答题】Why cannot the two following subtopic sentences be put together to support the same topic sentence? Topic sentence: Hitchhiking is erous. Subtopic sentence: Hitchhiking is erous because too ma...
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