单项选择题
A.close the tank filling valves quickly
B.top off all tanks at the same time
C.rill completely all tanks to less than 95% full
D.reduce the loading rate when topping off
单项选择题 Which of the precautions listed should be observed when taking on diesel fuel?（）
单项选择题 Before the seas get rough, it is a good safety practice to （）.
单项选择题 Which of the fire extinguishers listed is to be weighed annually and sent ashore for recharging if the weight loss exceeds 10% of the weight of a full charge?（）