vb打造截取特定区域，仿QQ截取图片~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
2019-12-21 19:34:08
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可以用来提取IGS全球服务组织CODE中心电离层VTEC数据-IGS can be used to extract a global service organization CODE ionospheric VTEC data center
2019-12-21 19:22:38
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