air to air heat recovery unit
air to air missile launching envelope
TAR tissue to air ratio
optimum coal mixture scheme
optimum ratio of fertilization
optimum ratio of metathesis
optimum ratio of nutrient elements
optimum ratio of ridge to furrow
air to surface area ratio
air to water heat exchanger
air to water system
空气-水调节系统
空气-水第系统
机组资源管理(CRM)