请问：DMA, DMB, DMC, DMX的概念出自哪里？

fzhrxy

谢谢大家了
不知道这个概念

Chuangong

3a. marine diesel oil means any marine fuel which
has a viscosity or density falling within the
ranges of viscosity or density defined for DMB
and DMC grades in Table I of ISO 8217;
3b. marine gas oil means any marine fuel which has
a viscosity or density falling within the ranges
of viscosity or density defined for DMX and
DMA grades in Table I of ISO 8217;