Before loading bulk grain, bilge wells must be covered to ______.
A.add strength to the bilge well strainer
B.permit rapid flow of water to the bilge wells
C.prevent cargo sifting into the bilge wells
D.prevent oil, water, or other liquid from reaching the cargo
正确答案：C
在装载散装谷物之前(舱底)污水井必须被盖上以防止货物进入其中
