不同规格大截面导线
Large Sectional Conductors with Different Sizes
《国际海运危险货物规则》国际海上危险货物运输规则
international maritime dangerous goods code
国际海上危险品货物规则
international maritime dangerous goods code
可燃毒物规格
burnable poison specification
L-半格同余
congruence of L-semilattice