A.常壓/低壓 B.低壓/常壓 C.高壓/低壓 D.低壓/高壓
A.關(guān)閉通風(fēng)口 B.向艙內(nèi)示警 C.搶救出貴重物品 D.開大通風(fēng)口
A.1%/5% B.5%/10% C.10%/15% D.15%/20%