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【单选题】
某船的甲板室座落于艉楼甲板上，在甲板室侧面外围壁上有一个400X400毫米的通风开口通向主甲板以下机舱区域内的一个小储藏室。围壁上的开口下缘距艉楼甲板高度为2.1米，开口上装有一个钢制风雨密盖，盖子只用一个搭扣将其保持在关闭位置。关于这个关闭装置，下列哪一种说法最正确？（）
A.
这个开口离艉楼甲板超过900毫米高，可以不要盖子。
B.
机舱区域内的储藏室不需要通风，这个开口应永久性封闭。
C.
艉楼甲板属于位置2，位的通向干舷甲板以下处所的通风开口低于2.3米时，必须加装足够有效的风雨密关闭装置。一个搭扣不能足够有效地保持风雨密。
D.
在这个位置上浪机会并不大，有一个盖子遮挡一下就够了，甚至那个搭扣也可以取消。
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