A.按動(dòng)I端風(fēng)笛按鈕時(shí),I端風(fēng)笛響 B.按動(dòng)I端風(fēng)笛按鈕時(shí),II端風(fēng)笛響 C.按動(dòng)II端風(fēng)笛按鈕時(shí),I端風(fēng)笛響 D.按動(dòng)II端風(fēng)笛按鈕時(shí),II端風(fēng)笛響
A.一輪應(yīng)撒砂 B.三輪應(yīng)撒砂 C.四輪應(yīng)撒砂 D.六輪應(yīng)撒砂