题目内容
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[判断题]
根据压力管道设计类别、级别的划分,可输送火灾危险性为甲、乙类可燃气体或甲类可燃液体介质的GC2级的长输管道,其设计压力为P<4.0MPa。()
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A.GC1
B.GC2级
C.GC3级
D.以上均不对
A.毒性程度
B.火灾危险性
C.设计压力及设计温度
D.以上全是
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.GC1
B.GC1、GC2
C.GB1
D.GC1、GB1
A.场地土的类型是确定建筑场地类别的条件之一
B.建筑场地的类别应根据剪切波速划分
C.建筑场地的类别应根据岩土的名称和性状来划分
D.建筑场地的类别由基础的埋置深度确定。
A.移动用户划分到租约期较长的类别
B.固定用户划分到租约期较短的类别
C.服务器划分到租约期最短的类别
D.服务器可以采用保留地址