What is the main purpose of dunnage().

问题补充：

题目类型：[单选] 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 bulkhead

答案：

参考答案: B

试题难度：★★☆

参考解析：