铸造合金在凝固过程中,液、固相混杂的双相区域的宽窄,即凝固区域的宽度,对合金的流动性有较大的影响。下列不会影响到凝固区域宽度的因素是( )。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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