液氧
Long March 2, Long March 3, Long March 4, the main stages and associated liquid rocket boosters use dinitrogen tetroxide (N2O4) as the oxidizing agent and UDMH as the fuel. The upper stages (third stage) of Long March 3 rockets use YF-73 and YF-75 engines, using Liquid hydrogen (LH2) as the fuel and Liquid oxygen (LOX) as the oxidizer.