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[单选题]
WD£320控制动力稳定车左侧钢轨压力控制及激振器振动频率的电路板是()。
A.EK-2030LV
B.EK-2031LV
C.EK-2032LV
D.EK-2033LV
查看答案
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A.EK-2030LV
B.EK-2031LV
C.EK-2032LV
D.EK-2033LV
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 |
A.显示控制计算机
B.系统控制计算机
C.识别计算机
D.空间转换计算机