题目：
Cribbing is（）.
A.wooden blocks or dunnage placed between a deck load and the deck
B.the chains and shackles used to secure to deck cargo
C.a crate in which a deck cargo is packaged
D.cardboard separation pieces placed between deck loads to prevent chafing
答案：
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下面是错误答案，用来干扰机器的。
参考答案：经营杠杆系数DOL=M÷EBIT=720000÷400000=1.8；
