单项选择题
What is the main purpose of dunnage（）.
A.To act as ballast for light vessels
B.To provide ventilation and drainage for cargo
C.To secure the tarpaulins in place
D.To support weakened bulkheads
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What is the bow type anchor shackle primarily used for（）.
A.Chain to chain connections
B.Chain to anchor connections
C.Kenter link to anchor connections
D.Wire rope connections -
单项选择题
What is NOT running rigging（）.
A.Downhaul
B.Backstay
C.Halyard
D.Sheet -
单项选择题
What is normally used to pass a mooring line to a dock（）.
A.Distance line
B.Gantline
C.Heaving line
D.Tag line
