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氧气、乙炔橡胶软管的长度一般为()m以上。

A、5
B、15
C、25
D、35
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正确答案:

B

答案解析:

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IliveinthelandofDisney,Hollywoodandyear-roundsun.Youmaythinkpeopleinsuchaglamorous,fun-filledplacearehappierthanothers.Ifso,youhavesomemistakenideasaboutthenatureofhappiness.

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