Database error: Invalid SQL: select * from pwn_comment where iffb='1' and catid='1' and pid='0' and rid='299' order by dtime desc limit 0,5
MySQL Error: 1194 (Table 'pwn_comment' is marked as crashed and should be repaired)
#0 dbbase_sql->halt(Invalid SQL: select * from pwn_comment where iffb='1' and catid='1' and pid='0' and rid='299' order by dtime desc limit 0,5) called at [D:\freehost\39jjfhc\web\includes\db.inc.php:73] #1 dbbase_sql->query(select * from {P}_comment where iffb='1' and catid='1' and pid='0' and rid='299' order by dtime desc limit 0,5) called at [D:\freehost\39jjfhc\web\news\module\NewsComment.php:48] #2 NewsComment() called at [D:\freehost\39jjfhc\web\includes\common.inc.php:518] #3 printpage() called at [D:\freehost\39jjfhc\web\news\html\index.php:15] Database error: Invalid SQL: select count(id) from pwn_comment where catid='1' and rid='299'
MySQL Error: 1194 (Table 'pwn_comment' is marked as crashed and should be repaired)
#0 dbbase_sql->halt(Invalid SQL: select count(id) from pwn_comment where catid='1' and rid='299') called at [D:\freehost\39jjfhc\web\includes\db.inc.php:73] #1 dbbase_sql->query(select count(id) from {P}_comment where catid='1' and rid='299') called at [D:\freehost\39jjfhc\web\news\module\NewsContent.php:163] #2 NewsContent() called at [D:\freehost\39jjfhc\web\includes\common.inc.php:518] #3 printpage() called at [D:\freehost\39jjfhc\web\news\html\index.php:15] Database error: Invalid SQL: select sum(pj1) from pwn_comment where catid='1' and rid='299'
MySQL Error: 1194 (Table 'pwn_comment' is marked as crashed and should be repaired)
#0 dbbase_sql->halt(Invalid SQL: select sum(pj1) from pwn_comment where catid='1' and rid='299') called at [D:\freehost\39jjfhc\web\includes\db.inc.php:73] #1 dbbase_sql->query(select sum(pj1) from {P}_comment where catid='1' and rid='299') called at [D:\freehost\39jjfhc\web\news\module\NewsContent.php:169] #2 NewsContent() called at [D:\freehost\39jjfhc\web\includes\common.inc.php:518] #3 printpage() called at [D:\freehost\39jjfhc\web\news\html\index.php:15] 锁具的材料及表面处理-甲级防火窗耐火极限甲级防火门耐火极限甲级防火卷帘耐火极限
 
 
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锁具的材料及表面处理
作者:系统管理员    发布于:2009-04-02 08:47:15    文字:【】【】【
人们选购锁具时,普遍均担心锁具不耐用或用不了多久表面便生锈或氧化。这个问题是关系到使用的材料及表面处理问题。
从耐用的角度看,最好的材料应是不锈钢,尤其是用作表面材料,越用越光亮。其强度好、耐腐蚀性强、颜色不变。但不锈钢也有多种,主要可分为铁素体和奥氏体。铁素体不锈钢有磁性,俗称不锈铁,时间长,环境不好也会生锈,只有奥氏体不锈钢才不会生锈,鉴别办法很简单,用磁铁一试即可鉴别。
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