A PHP Error was encountered

Severity: Notice

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

Filename: models/Site_model.php

Line Number: 233

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: 109
Function: get_keyword_cat

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

A PHP Error was encountered

Severity: Notice

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

Filename: models/Site_model.php

Line Number: 233

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 - 退火目的 - 前往 https://ref.ncl.edu.tw/學科專家諮詢平台/問題選粹-blog/231-金屬材料上常見淬火、回火、退火等專有名詞，請問其功用？
疑難雜症萬事通
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您即將離開本站

並前往 https://ref.ncl.edu.tw/%E5%AD%B8%E7%A7%91%E5%B0%88%E5%AE%B6%E8%AB%AE%E8%A9%A2%E5%B9%B3%E5%8F%B0/%E5%95%8F%E9%A1%8C%E9%81%B8%E7%B2%B9-blog/231-%E9%87%91%E5%B1%AC%E6%9D%90%E6%96%99%E4%B8%8A%E5%B8%B8%E8%A6%8B%E6%B7%AC%E7%81%AB%E3%80%81%E5%9B%9E%E7%81%AB%E3%80%81%E9%80%80%E7%81%AB%E7%AD%89%E5%B0%88%E6%9C%89%E5%90%8D%E8%A9%9E%EF%BC%8C%E8%AB%8B%E5%95%8F%E5%85%B6%E5%8A%9F%E7%94%A8%EF%BC%9F

是否確定要離開？