双层底的作用是:()
①、增加总纵强度;②、增加船底局部强度;③、调整船舶吃水;④、改善航行性能;⑤、提高抗沉性
A.①~⑤
B.②~⑤
C.①、②、④、⑤
D.①~④
参考答案:A
They desired that they __________ the right to attend the meeting.[ ]
A. had
B. have
C. are
D. were