A.120 B.125 C.130 D.135
A.2.3 B.2.4 C.2.45 D.2.5
A.無色有刺激性氣味的氣體 B.對(duì)眼、呼吸系統(tǒng)粘膜有刺激作用 C.可燃燒、可助燃 D.比空氣輕