What is the main purpose of dunnage（）.<br>A:To act as ballast for light vessels<br>B:To provide ventilation and drainage for cargo<br>C:To secure the tarpaulins in place<br>D:To support weakened bulkheads

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

出自：海船船员证

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