清点;
note that if several counting functions or tests operate on the same column, then the sort and count operations only need to be done once.
注意,如果多个计数函数或测试在同一列上运行,那么排序与计数操作仅需做一次。
Methods To investigation the cases of 501 pilots who recuperate in our sanatorium on 1~ 10,2003, find 15 lumbar intervertebral discs, sort and count and compare them by airplane's type and pilots' age.
方法对2003年1~10月来我院疗养的501名飞行员的疗案进行调查,按飞行机种和飞行员年龄进行分类统计,并做比较。
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