题目内容
(请给出正确答案)
[单选题]
在下列通风方式中,借助于室内外空气自然的压力(风压和热压)作用促使空气流动的是()。
A.局部通风
B.全面通风
C.自然通风
D.机械通风
答案
查看答案
A.局部通风
B.全面通风
C.自然通风
D.机械通风
第2题
A.5000-5500
B.5300-5800k
C.3000-5500
D.5000-6000
第5题
根据气力输送的特点,降低动力消耗,节约能源是一个重要的研究课题,从经验中知,管道内径是关于能耗的重要参数。直观上看,当输送量一定时,管径过小,输送易阻滞,管径过大,虽输送畅通,但又造成能量的浪费。根据经验,把管径分成三组,各组的试验结果如下表所示,试用方差分析法比较各组的效果.
管径(mm) | 单位功耗 |
230 | 0.0308,0.0476,0.0504 |
250~260 | 0.0532,0.032,0.0218,0.028,0.028, 0.042,0.0336,0.042,0.042,0.028 |
280~320 | 0.07,0.07,0.0644,0.0312,0.0756,0.0756, 0.07,0.0588,0.0588,0.042,0.0308,0.0364, 0.0448,0.21,0.154,0.1064,0.1288,0.112, 0.1064,0.1288,0.0756,0.0644,0.0504,0.0644, 0.0504,0.0308 |
第11题