As only a very general rule, most sailboats over 20-something feet have fixed keels.
作为一条通常规律，大部分20英尺以上的帆船使用固定龙骨。
Sailboats have many different types of fixed keels, such as full keels (see photo) and fin keels.
帆船有许多种不同类型的固定龙骨，例如全龙骨(见上图)及鳍板。
If you are shopping for a sailboat in this range, you should understand the differences between these fundamental types of keels.
若你是在这个尺寸范围内寻购帆船，那你应该学习了解一下龙骨的这些基本类型之间的差别。
Fixed keels and centerboards each have their own benefits but also disadvantages. When deciding what type of boat to buy, be sure you have considered these differences.
固定龙骨和活动龙骨各有其优势和缺陷，当在其中进行选购时，确保你考虑了以下这些差异。
Corrosion on Aluminum vessels is also generally in the form of localized pitting to the hull plate, rudders, bilge keels and particularly in way of weld seams.
铝制船舶上的腐蚀的通常形式是船体钢板、船舵、船底龙骨上的局部点状腐蚀，特别是在焊缝方面。
The structural element consists of a construction formwork mesh sheet (1) and light steel keels (2) and (3) which are connected by self-tapping screws or rivets.
结构体由建筑模网网片（1）及轻钢龙骨（2）和（3）构成，以自攻钉或铆钉连接。
While the current devices differ in design, those devices with keels violating the endplates present the risk of complications associated with vertebral body damage.
目前的器械设计各不相同，带有干扰终板的突起的器械存在椎体损害相关并发症的可能。
Satisfactory results have been obtained by applying this method to calculate motions of different types of ship, including those body-plan sections with bilge keels.
此方法已对各种不同的船型剖面，包括具有舭龙骨剖面的船舶进行了运动计算，并获得了满意的结果。
Our main products are all grade of S4S furniture timber kit, KD timber, Flooring Keels, Ceiling Keels, strip and so on.
经营产品主要有各种规格和等级的家具刨光套材，烘干规格料、板材、地板龙骨、吊顶龙骨、白松条等。
Our main products are all grade of S4S furniture timber kit, KD timber, Flooring Keels, Ceiling Keels, strip and so on.
经营产品主要有各种规格和等级的家具刨光套材，烘干规格料、板材、地板龙骨、吊顶龙骨、白松条等。
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