单项选择题
A.Start ventilation，lower the ramp，notify engine room
B.Lower the ramp，start ventilation，notify engine room
C.Notify engine room，lower the ramp，start ventilation
D.Start ventilation，notify engine room，lower the ramp
单项选择题 Which of the following is suitable for bagged cargo?（）.
单项选择题 Which of the following element(s) should be taken into account in the preparation of the “Cargo Securing Manual”? （）
单项选择题 Which of the following actions are stated in the correct order prior to loading or discharging cargo on a Ro-Ro vessel? （）