用某尺子对一物体的长度进行15次重复测量,计算得A类不确定度为0.01mm,B类不确定度是0.6mm,如果用该尺子测量类似长度,应选择的合理测量次数为( )
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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