For example, with the wind at an intensity that a sloop might have to double-reef the main to reduce sail area, a ketch may sail very well under just jib and mizzen.
例如，当风速在某个强度上时，单桅帆可能必须将主帆四叠起来以减少帆面积，而双桅帆则可以只用前帆和后帆来顺利航行。
In chapter 4, in order to ascertain its inherent eigenvalue and corresponding main vibration, modal analysis is first implemented for the jib structure of deck crane.
在第4章中先对甲板吊臂架结构进行模态分析，确定结构的固有频率和相应的主振型。
Finally, the description of rules is drawn that the optimal moment center changes with the main parameters of jib.
同时给出全力矩取矩中心随塔机吊臂等主要参数变化而变化的趋势描述。
A new-type quayside container crane with jib-bridge luffing system as the main working part is brought out.
提出一种以臂桥架变幅系统为主要工作机构的岸边集装箱起重机。
The overall stability analysis of the crane's lattice jib with main and vice-jib structure is even more difficult to technician in our country.
具有变截面臂架的格构式起重机之整体稳定性分析更是目前我国起重机设计分析人员所面临的难题。
This paper presents the main types and features of luffing mechanisms of goose neck jib lorry loading cranes and proposes design requirements for 304304 type luffing mechanism.
介绍了随车起重机变幅机构的主要形式和特点，提出304304型变幅机构在设计时的要求。
This paper presents the main types and features of luffing mechanisms of goose neck jib lorry loading cranes and proposes design requirements for 304304 type luffing mechanism.
介绍了随车起重机变幅机构的主要形式和特点，提出304304型变幅机构在设计时的要求。
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