西周时,格伯以良马四匹折价,购买倗生三十田。双方签订买卖契约,刻写竹简之上,中破为两半,双方各执一半。依西周礼法,该契约的称谓是( )
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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