矿物油是一种混合物，由长短不一的碳链和几个碳氢化合物混合而成。
The mineral oils are a mix of several hydrocarbons with different length of carbon chain.
单孔式回油，模具采用高碳钨合金钢不易破损。
Punch dies made of high carbon tungsten steel and not easy to wear off.
单孔式回油，模具采用高碳钨合金钢不易破损。
Punch dies made of high carbon tungsten steel and not easy to wear off.
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