A.煤壁“掛紅”、“掛汗” B.空氣變冷、出現(xiàn)霧氣 C.水色發(fā)渾、出現(xiàn)臭味 D.刮板斷鏈、皮帶不能啟動(dòng)
A.0.1% B.0.2% C.0.5% D.1%
A.36 B.48 C.72 D.127