Array
(
[0] => Array
(
[id] => 2
[name] => 首页
[category_id] => 221
[url] =>
[active] => 1
[position] => 1
[blank] =>
[is_out] =>
)
[1] => Array
(
[id] => 4
[name] => 氿上商城
[category_id] => 221
[url] => goods
[active] => 1
[position] => 2
[blank] =>
[is_out] =>
)
[2] => Array
(
[id] => 1
[name] => 学习园地
[category_id] => 221
[url] => news
[active] => 1
[position] => 5
[blank] =>
[is_out] =>
)
[3] => Array
(
[id] => 16
[name] => 氿上知道
[category_id] => 221
[url] => question
[active] => 1
[position] => 4
[blank] =>
[is_out] =>
)
[4] => Array
(
[id] => 5
[name] => 供求信息
[category_id] => 221
[url] => trade
[active] => 1
[position] => 3
[blank] =>
[is_out] =>
)
[5] => Array
(
[id] => 3
[name] => 软件下载
[category_id] => 221
[url] => jsyjj/list/409
[active] => 1
[position] => 6
[blank] =>
[is_out] =>
)
[6] => Array
(
[id] => 46
[name] => 氿上云管理
[category_id] => 221
[url] => yun/index
[active] => 1
[position] => 7
[blank] =>
[is_out] =>
)
[7] => Array
(
[id] => 22
[name] => 氿上花园
[category_id] => 221
[url] => garden
[active] => 1
[position] => 999
[blank] =>
[is_out] =>
)
)
Q235和Q345在实际应用中的区别 - 工程施工 - 项目管理 - 氿上知道
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满意答案
如果设计的刚架以强度为主要参数，采用345B比较节省，
如果刚架以控制挠度为主，最好采用Q235B比较节省
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回答于：2014-07-16
共2条回答