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【单选题】
某车间设有局部排风系统,局部排风量为 0.56kg/s ,冬季室内工作区温度为 15 °C ,冬季 室外计算温度为 -25 °C ,(大气为标准大气压,空气定压比热 1.01kJ/(kg· °C ) 。围护结构耗热量为 8.8KW, 室内维持负压,机械进风量为排风量的 90% ,试求机械通风量和送风温度为下列何A.
0.3~0.53 kg/s ， 29~32 ℃
B.
0.54~0.65 kg/s ， 29~32 ℃
C.
0.54~0.65 kg/s ， 33~36.5 ℃
D.
0.3~0.53 kg/s ， 36.6~38.5 ℃
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举一反三
【简答题】“笔墨丹青”中，“丹”指的是什么颜色？
【判断题】The author said that the typewriter his mother had purchased was useful. (Unit 5 The Day Mother Cried)
A.
正确
B.
错误
【单选题】The author said that the typewriter his mother had purchased was ______.
A.
useful
B.
useless
C.
of some use
D.
secondhand
【简答题】The author said that the incident was key because it pointed to ______________ in the educational and artistic practices in China and America.
【单选题】The author said that the typewriter his mother bought was_____.
A.
useless
B.
useful
C.
of some use
D.
of little use
【单选题】2005年7月4日美国进行了“炮轰”彗星太空实验。这次实验在帮助人类首次揭开彗星内部秘密的同时,也会帮助揭开地球乃至整个太阳系的起源和宇宙生命起源之谜。这说明( )
A.
意识是与物质同时存在、共同发展的
B.
意识能够完全地反映客观世界
C.
意识能够正确地反映客观事物的本质和规律
D.
意识是经过实践检验的正确认识
【判断题】The author said that the typewriter his mother had purchased was useless. (Unit 5 The Day Mother Cried)
A.
正确
B.
错误
【单选题】The author said that he was overawed by
A.
the beauty of the scene
B.
the sight of Damascus
C.
the age of the place
D.
the world of Allah and Muhammad
【单选题】The author said that a man can readily forget a woman's face because of the following reasons except________.
A.
a woman's face will change with age
B.
a woman will present different looks when she wears different clothes
C.
a man has poor memory
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