单选题Seamless mild steel is used for steam (also copper for moderate pressure and temperature), h-pair, feed discharge and all oil fuel pressure pipingsAccording to the above sentence, which of the following statements is not true?（）ABoth seamless mild steel and copper may be used for middle pressure steamBhpair means high pressure airCThe feed piping of the boilers can be made of seamless mild steelDAll oil pipings are made of mild steel
单选题
Seamless mild steel is used for steam (also copper for moderate pressure and temperature), h-pair, feed discharge and all oil fuel pressure pipingsAccording to the above sentence, which of the following statements is not true?（）
A
Both seamless mild steel and copper may be used for middle pressure steam
B
hpair means high pressure air
C
The feed piping of the boilers can be made of seamless mild steel
D
All oil pipings are made of mild steel
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