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老師可以為我解答第11題嘛
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Geoian
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Sep 19, 2016, 8:07:53 AM
9/19/16
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如題。
S_4934365861096.jpg
Geoian
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Sep 19, 2016, 8:08:46 AM
9/19/16
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自流井兩個條件：1、不透水層之下；2、井口位置較低。
Geoian於 2016年9月19日星期一 UTC+8下午8時07分53秒寫道：
如題。
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