A mechanical davit is designed to automatically（）.

A.position the boat at the embarkation station

B.lift the boat off the inboard chocks

C.energize the winch for the falls

D.set the brake on the winch

YB45包装机，当检测器未能检测到折翼储胶水缸的存在则显示“折翼粘胶储胶水缸异位”故障。