当车辆受牵引力时,作用力的传递过程为:车钩→钩尾框→___________→缓冲器→前从板→_____________→牵引梁;当车辆受冲击时,作用力的传递过程为:车钩→前从板→缓冲器→后从板→后从板座→牵引梁。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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