梁沿斜截面破坏时,当裂缝一出现,很快形成一条主要斜裂缝,并迅速延伸至荷载作用点,使梁斜向被拉断,这种破坏称为:
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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