伤寒早期体内出现() ["毒血症","菌血症","败血症","脓毒血症","内毒素血症"]
某企业的110kV变电所,地处海拔高度900m,110kV采用半高型户外配电装置,110kV配电装置母线高10m,35kV及10kV配电装置选用移开式交流金属封闭开关柜,室内单层布置,主变压器布置在室外,请回答下列问题:确定在选择110kV变压器时,变压器的内绝缘相对地和相间的雷电冲击耐受电压应为下列哪项?请说明依据和理由()。 ["A.200kV、200kV","395kV、395kV","450kV、450kV","480kV、480kV"]
燃油炉尾部受热面最易采用除灰方法是:() ["A、压力吹灰","B、蒸汽吹灰","C、钢珠除灰"]
排烟热损失与下列哪些因素有关() ["A、排烟温度","B、排烟处过量空气系数","C、炉体外表面温度","D、炉渣含碳量"]
患者,男性,60岁,咳血丝痰1个月余,吸烟20余年,体检左侧呼吸音减弱,外院X线平片提示左肺门浓密。进一步的影像学检查方法为() ["A.SPECT","超声","CT","PET","MRI"]
当线路跨越通航江河时,应采取措施设立标志,防止()。