单项选择题
A.ventilate all compartments，see that the machinery is clean and there are no obstructions
B.just turn the key and start up
C.take for granted that there are no fuel leaks
D.assume there are no volatile fumes in the engine space
单项选择题 Among the possible causes of unexpected constant inclination of the floating shhip is（）.
单项选择题 According to the Insurance Terms of PICC，All Risk covers（）.
单项选择题 A vessel which is being assisted by an icebreaker would display a flag hoist consisting of the code numeral “4”when the vessel（）.