A.3 B.4 C.5 D.6
A.15 B.20 C.25 D.30
A.司機對講按鈕 B.人工廣播按鈕 C.乘客緊急對講按鈕 D.司機室監(jiān)聽揚聲器音量調(diào)節(jié)開關(guān)
