条件连续比率
为了减少符号之间的巨大差别,再加进去一个条件,例如对准线开平方,或简单地大符号对应大数据,小符号对应小数据。每个符号与每个数据对应。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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