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Warning: Declaration of shailan_PageWalker::end_lvl(&$output, $depth) should be compatible with Walker::end_lvl(&$output, $depth = 0, $args = Array) in /home/suachnhahn/domains/suachuanhahanoi.com/public_html/wp-content/plugins/dropdown-menu-widget/shailan-page-walker.php on line 111

Warning: Declaration of shailan_PageWalker::start_el(&$output, $page, $depth, $args = Array, $current_page = NULL) should be compatible with Walker::start_el(&$output, $object, $depth = 0, $args = Array, $current_object_id = 0) in /home/suachnhahn/domains/suachuanhahanoi.com/public_html/wp-content/plugins/dropdown-menu-widget/shailan-page-walker.php on line 111

Warning: Declaration of shailan_PageWalker::end_el(&$output, $page, $depth) should be compatible with Walker::end_el(&$output, $object, $depth = 0, $args = Array) in /home/suachnhahn/domains/suachuanhahanoi.com/public_html/wp-content/plugins/dropdown-menu-widget/shailan-page-walker.php on line 111

Warning: Declaration of shailan_CategoryWalker::start_lvl(&$output, $depth, $args) should be compatible with Walker::start_lvl(&$output, $depth = 0, $args = Array) in /home/suachnhahn/domains/suachuanhahanoi.com/public_html/wp-content/plugins/dropdown-menu-widget/shailan-category-walker.php on line 154

Warning: Declaration of shailan_CategoryWalker::end_lvl(&$output, $depth, $args) should be compatible with Walker::end_lvl(&$output, $depth = 0, $args = Array) in /home/suachnhahn/domains/suachuanhahanoi.com/public_html/wp-content/plugins/dropdown-menu-widget/shailan-category-walker.php on line 154

Warning: Declaration of shailan_CategoryWalker::start_el(&$output, $category, $depth, $args) should be compatible with Walker::start_el(&$output, $object, $depth = 0, $args = Array, $current_object_id = 0) in /home/suachnhahn/domains/suachuanhahanoi.com/public_html/wp-content/plugins/dropdown-menu-widget/shailan-category-walker.php on line 154

Warning: Declaration of shailan_CategoryWalker::end_el(&$output, $page, $depth, $args) should be compatible with Walker::end_el(&$output, $object, $depth = 0, $args = Array) in /home/suachnhahn/domains/suachuanhahanoi.com/public_html/wp-content/plugins/dropdown-menu-widget/shailan-category-walker.php on line 154

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Hiện tượng: Các kết cấu thép trong nhà như thép chịu lực hệ khung bê tông cốt thép, dây tiếp địa chống sét, cột thu lôi, cọc tiếp địa, các hoa sắt cửa, … bị gỉ, ăn mòn do tác