Auxiliary boilers are divided into several classifications, one of which is（） ["fire-tube controlled circulation","fire-tube supercritical circulation","water-tube natural circulation","water-tube express circulatio"]
最基本的医学知识包括（） ["基础医学和临床医学知识","心理学、社会学","医学心理学、家庭动力学理论","医学伦理学、社会医学"]
变电站母线并联电容器各种保护跳闸如何处理？
关于N52发动机冷却系统排气方法描述正确的是（） ["打开冷却液补液罐的盖子","连接蓄电池，打开点火开关","将空调系统温度开到最高，风速调整到最低","将油门踏板踩到底并保持10秒钟以上"]
Which of the lists forms of heat transfer, if any, is illustrated by the flow of combustion gases through a boiler?（） ["Natural convection only","Forced convection only","Both natural convection and forced convection","None"]
简述影响整经卷绕密度的因素。
