下列关于氧气管道安全控制措施的说法，错误的是（）。

A、架空氧气管道与明火地点等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，应设在乙炔管进的下方

C、氧气管道与油质管道同沟敷设时，应设在乙炔管道的下方

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

当煤气管道与氧气管等助燃气体管共架时，其最小净距应为（)mm。
A．500
B．600
C．700
D．800

题型：单选题

架空煤气管道与其他管道共架敷设时的注意事项，下列说法错误的是（）。

A.煤气管道与水管、热力管、燃油管、不燃气体管在同一支柱或找桥上敷设，其上下敷设的垂直净距不小于250mm

B.为便于操作、检修和抽堵盲板，重油管和氧气管可以敷设在同一侧

C.其他管道架设在管径大于或等于1200mm的煤气管道上时，管道上面预留600mm的通行道

D.其他管道的托架均应焊在煤气管道的加固圈上，加固圈的长度可根据荷载的大小选定，一般为（1/6～1）管道周长，但不小于200mm

乙炔一般不与其他管线同沟敷设，但可与同一使用目的的氧气管平行敷设，间隔最少为（），且地沟内应填满黄砂。

A、250mm

B、500mm

C、400mm

D、300mm。

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