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If you must jump from a ship，your posture should include（）.
A:holding down the life preserver against the chest with one arm crossing the other，covering the mouth and nose with a hand，and feet together
B:knees bent and held close to the body with both arms around legs
C:body straight and arms held tightly at the sides for feet first entry into the water
D:both hands holding the life preserver below the chin，with knees bent，and legs crossed

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出自：海船船员证

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