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A PHP Error was encountered

Severity: Notice

Message: Trying to access array offset on value of type null

Filename: models/Site_model.php

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Backtrace:

File: /var/www/html/KOL/voice/application/models/Site_model.php
Line: 233
Function: _error_handler

File: /var/www/html/KOL/voice/application/controllers/Exitpage.php
Line: 110
Function: get_keyword_cat

File: /var/www/html/KOL/voice/public/index.php
Line: 319
Function: require_once

疑難雜症萬事通 - 若材料承受雙軸向應力x及y作用則與材料橫截面成45之斜截面上的正交應力為 - 前往 https://www.ltedu.com.tw/web/download.ashx?action=1&URL=8/2015/1211102524Post/files/機械力學II教師手冊 ch10.doc&FN=機械力學II教師手冊 ch10.doc
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