单项选择题
（）are to be used for dunnage if you load rice.
A.Wooden planks B.Rush mats C.Steel bars D.Wooden planks and rush mats
单项选择题 （）is known as a long hatch during loading operation.
单项选择题 （）is the tendency of a vessel to return to its origianl position after it is displaced therefrom.
单项选择题 （）refers to the tendency of a body of the ship to return to its original position after it is displaced therefrom.
