下列关于氧气管道安全措施的说法，错误的是（）。
A、架空氧气管道与明火之间的最小净距不应小于10m
B、氧气管道与乙炔管道共架敷设时，应设在乙块管道下方
C、氧气管道与油质管道同沟敷设时，应设在油质管道下方
D、氧气管道上的法兰连接和螺纹连接处，应用金属导线跨接，跨接电阻应小于0.03Ω
气化界区内氧气管道上有几个流量传感器，为什么要这么多流量传感器？它们与安全系统的关系是怎样的？
A warm-hearted （热心的) nurse on her first day's work went near to a patient （病人). He has come to London as a tourist. She asked him if she could do something for him, but he only waved （摇) his hand and said something she could not understand. With a smile she asked him again and he just kept saying the same word but in a very much lower voice （声音) before closing his eyes. She ran to the doctor and repeated（重复) to him the sounds she had heard: "My dear girl," said the doctor after listening carefully to what she repeated, he was saying, " You are standing on I oxygen pipe （氧气管)!"
In the story, the nurse and the patient ______.
A．speak the same language
B．speak different languages
C．can't hear each other