Hydraulic sequential circuit or mechanical mutual interlocking gear should be flexible mast to avoid misoperation.

伸缩式井架应设置液压顺序回路或机械互锁机构,以防止误操作.

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This two - person keelboat is known for its relative small cockpit and its flexible mast.

这艘双人龙骨船的特点在于它相对较小的船舱和灵活的桅杆.

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