单项选择题
A.gently flooding with water
B.warming the eye with moist warm packs
C.laying the person flat on his back
D.mineral oil drops directly on the eye
单项选择题 A mechanical davit is designed to automatically（）.
单项选择题 A helicopter making a round trip from a helideck with refueling capabilities to an unmanned platform will take 45 minutes each way. The helicopter should be carrying enough fuel to last（）.
单项选择题 A floating ship with an initial negative metacentric height（）.