单项选择题
When lowering lifeboats in heavy seas，a good practice is to rig frapping lines（）.
A.on only the forward falls
B.on only the after falls
C.with a lead of about 45 degrees to the boat
D.from the falls to the main deck of the vessel
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What is TRUE about hoisting operations（）.
A.Personnel may work beneath suspended loads，as long as they are alert and wear hard hats
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D.effected
