[问答题,简答题] 熔断器是怎样选用的？

制冷系统试运行前的准备和检查工作有哪些？ 低加解列（）S后判断为RB失败 ["2000S","1000S","1500S","2500S"] 汽泵前置泵停止时，延时（）跳汽泵 ["2S","3S","4S","无延时"] 高加解列（）S后判断为RB失败 ["2000S","1000S","1500S","2500S"] 热球式风速仪的测量位置在哪里？ 熔断器是怎样选用的？