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?（）
A.Posting posters illustrating practices B.Showing video tapes of actual accidents C.Incorporating safety practices in daily routine D.Publishing comprehensive safety rules
单项选择题 Which of the listed conditions can be considered as the single greatest cause of accidents?（）
单项选择题 Which of the following must be eliminated to prevent accidents?（）
单项选择题 Which of the following is not a recommended safe practice?（）
