单项选择题
A.氢气B.氮气C.氧气D.氯气
(A)空气 (B)氧气 (C)按一定比例混合的空气、氧气 (D)氯气
A.5minB.10minC.15minD.20min
A.5min B.10min C.15min D.20min
(A)九 (B)十 (C)十二 (D)十六
A.闪点B.燃点C.自燃点D.沸点
(A)七 (B)八 (C)九 (D)十
(A)20℃和101.3kPa (B)25℃和101.3kPa (C)20℃和101.3MPa (D)25℃和101.3MPa
(A)氰化钠 (B)砷化物 (C)化学农药 (D)病毒蛋白
(A)氯酸铵 (B)过氧化苯甲酰 (C)氢化钾 (D)三氯化钛