第13题:[单选题]时指示片由绿色变为黄色
When does the indicator from green change to yellow?( ) A.氧气瓶压力过大
Oxygen bottle pressure is overpress. B.低压管道压力过大
Low pressure pipe pressure is overpress. C.氧气瓶压力或低压管道压力过大
Oxygen bottle pressure is overpress or low pressure pipe pressure is overpress. 参考答案:C