In the stowage of deck cargo，cribbing is（）
题型：单项选择题
问题：
In the stowage of deck cargo，cribbing is（）.
A.placed on deck to support the cargo
B.separation pieces used to keep cylinders upright and steady
C.shims for stowing baled cargo
D.nets placed across the hatch opening to keep the cargo from falling in the hatch