题目内容
船舶的主尺度一般有船长、型宽、 和设计吃水等四个参数
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通过垂线间长的中点处所作的横向平面叫做 。
A letter of invitation can be classified into formal invitation and informal invitation.
Time and place for the occurrence（发生） of event should be made clear in the invitations.
You don’t have to mention reasons or meanings of the event when you write an invitation。
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