单项选择题
A.storing all items in an assigned place
B.storing all items in a common storage container except those ready-for-sea
C.tagging all items according to their age and then storing them together
D.disposing of worn-out items
单项选择题 To safeguard the operator and other personnel working on or near a hoisting operation which of the following precautions should be observed?（）
单项选择题 Which of the actions listed and instituted on your part will have the greatest lasting effect on the crew with respect to safety?（）
单项选择题 Which of the listed conditions can be considered as the single greatest cause of accidents?（）