单选题
发布日期:2021-03-22
the relief valve should open before the high-pressure cutout
the relief valve should open and let excess refrigerant go to receiver
the high-pressure cutout switch should operate before the relief valve opens
close in on the suction valve
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转子磁极具有凸极性的永磁同步电动机与电励磁凸极同步电动机在矩角特性上有什么差别?为什么?
甲、乙企业拟各投一部分资产组成一个新的公司,甲企业以某项技术投资,该技术的重置成本为200万元,企业无形资产成本利润率为500%,乙企业以部分有形资产投资,有形资产的重置成本为5000万元,成本利润率为15%。甲企业投资的无形资产的利润分成率为()
链形悬挂定位管在无偏移温度时,应垂直于(),两定位线夹在接触线上安装于定位管正下方两边各()毫米处;温度变化时,水平方向的偏角应与接触线在定位点的伸缩相适应,其偏角最大不超过()度。
放射性脊髓炎和脑病病人,如有残余癌灶或局部复发,应再次使用放射治疗。
矿体的产状
患儿男,6岁,因活动后气短就诊。查体发现胸骨左缘第2肋间可及收缩期震颤,并可及Ⅳ/6收缩期杂音,P2明显减弱。可能性最大的诊断是()
枳实薤白桂枝汤和小陷胸汤组成中均含有的药物是( )。
属于自制原始凭证的有()。
为达到相同的放射生物学效应,低LET射线对乏氧细胞所需的剂量比富氧细胞要大()
腕骨共8块,排列成两列,近侧列的腕骨是()
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If the head pressure is too high,()
If the head pressure is too high,()
One cause of high head pressure occurring in a refrigeration system can be ().
One cause of high head pressure occurring in a refrigeration system can be ().
High pressure and low pressure alarms must be tested().
Which of the following would not cause high suction pressure?()
Which of the following would not cause high suction pressure?()
The pressure head of a pump is given in the unit of ().
The pressure head of a pump is given in the unit of ().
The weather is often()in a high-pressure area.