单选题Personnel working aloft (above 2metres) should wear（）or other arresting device at all times.Aa safety harness with lifelineBa safety netCa life buoyDbuoyancy agarments
单选题
Personnel working aloft (above 2metres) should wear（）or other arresting device at all times.
A
a safety harness with lifeline
B
a safety net
C
a life buoy
D
buoyancy agarments
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