在①干接缝(梁翼缘、板);②湿接缝(梁翼缘、板);③箱板顶宽;④腹板或梁肋,这几项内容中,其中梁(板)的宽度包括的部分是()
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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