99色精品-9色在线-99色在线-99色视频 国产欧美日产一区二区三区_亚洲精品亚洲人成在线观看_四虎在线精品永久观看_免费一级a一片久久精

單項(xiàng)選擇題

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

微信掃碼免費(fèi)搜題