各类起重机共同的工作特点是作间歇性运动，即在一个工作循环中，进行取料、运移、卸载等动作的相应机构是交替工作的。
The work of the common characteristic is a sport in which a intermittent works cycles to take, it moves, unloading, the relevant agencies are to alternate work.
履带起重机在突然卸载时臂架后倾是整机稳定性和防后倾机构设计要考虑的工况。
The back-tipping of boom of crawler crane due to sudden unloading must be considered in design of anti-back-tipping device of crawler crane to ensure the stability of the complete crane.
履带起重机在突然卸载时臂架后倾是整机稳定性和防后倾机构设计要考虑的工况。
The back-tipping of boom of crawler crane due to sudden unloading must be considered in design of anti-back-tipping device of crawler crane to ensure the stability of the complete crane.
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