http://www.w3school.com.cn
https://sc.chinaz.com/tag_jiaocheng/PowerPointdonghuajiaocheng,huandengpianzhizuojiaocheng.html
https://www.4399.com/flash/193456.htm
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https://www.1ppt.com/kejian/64394.html
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https://www.1ppt.com/kejian/57382.html
http://www.downcc.com/soft/144904.html