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某镀锌钢管在镀锌前其黑铁管外径为32mm，壁厚为2mm，长度为2m，镀锌钢管比黑铁管增加的质量因数取1．05，该镀锌钢管的质量应为（）kg。 A．1．55B．2．82C．2．96D．3．11

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A) She started collecting stamps from her childhood. B) A good stamp collection can be built in a short time. C) A rare set of stamps is worth a lot of money, D) It is nearly impossible to collect a rare set of stamps.

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