The spine has been theorized as a "protected" environment because it is not a synovial joint, has less range of motion, and different loading mechanisms than the hip or knee joint.
因为脊柱不是滑膜关节，它的活动度小，与髋关节和膝关节的载入机制不同，所以被理论化为一种不受影响的环境。
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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