单项选择题
Before wore is commenced（）the officer responsible should ensure that power is shut off and warning notices posted on the bridge and in the machinery spaces.
A.near the ship’s whistle B.on the funnel C.in the vicinity of radio aerials D.near the radar scanner
单项选择题 Personnel working aloft (above 2metres) should wear（）or other arresting device at all times.
单项选择题 （）should generally best for handing acids,alkalis,various types of oils,solvents and chemicals in general.
单项选择题 （）should generally be used when handing rough or sharp objects.
