明史专家吴晗在《朱元璋》一书中写道:“在宋以前有三公坐而论道的说法„„到宋朝便不然了。从太祖以后,大臣上朝在皇帝面前无坐处,一坐群站,„„在明代,不但不许坐,站着都不行,得跪着说话了。”君臣关系从坐而站而跪这一现象说明()
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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