The area data of image classification was fairly close to those of second class investigation in each town.
各镇（林场）地类、林分面积与二类调查数据比较接近。
Methods: Census method and sampling survey method were both used to investigate the related data of the second-class large medical equipments in Henan province.
方法：采用普查法和抽样调查法相结合，对河南省乙类大型医用设备的相关资料进行了调查。
The second line of code in the example defines the event member in your class for an event that has no data.
此范例程序码中的第二行在您的类别中定义事件成员，该成员负责处理不带任何资料的事件。
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