Hydrocarbon service, mineral acids and salt solutions that are not corrosive to the metallic parts of the valve.
2
缺点：不耐酸尤其不耐矿物酸，不耐紫外线，无自熄性，不能近火。
Faults: no acid especially not resistant to mineral acid, not ultraviolet radiation resistant, no self-extinguishing RTV silicone compound, not near fire.
3
如果说有的话，也只有很少的矿物质、维生素、氨基酸和必须脂肪是不用于提供能量的。
There are few, if any, minerals, vitamins, amino acids and essential fats that are not used in creating energy.
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