一锅炉通过内径为3.5m的烟囱排除烟气,排放量为3.5×105m3/h,在烟气平均温度为260℃时,其平均密度为0.6kg/m3,平均黏度为2.8×10-4Pa·s。大气温度为20℃,在烟囱高度范围内平均密度为1.15kg/m3。为克服煤灰阻力,烟囱底部压力较地面大气压低245Pa。问此烟囱需要多高?假设粗糙度为5mm。
第1题
The different genres of Buddhist music performed on stage represent
A.a long history of Chinese Buddhism
B.richess of Chinese Buddhist music
C.many different temples across China
D.the three branches of Buddhism in China
第2题
A、The Chinese people have enriched Buddhism and developed some special Buddhist thoughts in the light of Chinese culture.
B、The Chinese people in the light of Chinese culture have enriched Buddhism and developed some special Buddhist thoughts.
C、/
D、/
第3题
第5题
第8题
第9题
A.Buddhist
B.Confucianism
C.Taoism
D.Islam
第10题
The audience at the music hall applauded enthusiastically after the piano solo.
A.laughed
B.clapped
C.jumped
D.chatted
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