单项选择题
A.The securing of cargo on flats and trailers and in containers must be adequate to withstand both road and sea motions
B.The generally recommended lash angle cannot be greater than 45 degrees relative to the deck inany direction
C.It is necessary for an adequate number of securing points on the vehicles themselves in order that lashings may be properly and safely utilized
D.All the above
单项选择题 Which of the following is the stated proper sequence before commencing cargo operations aboard Ro-Ro vessels?（）
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”? （）