PPR管用作给水管在国外已有几十年的历史，我国在1999年前后开始进口成品，现在大多自主生产。

• 1932 – First tubes were made from polyvinyl chloride (PVC) in Germany.
• 1935 – The first PVC pipes were manufactured (Germany).
• 1936 – PVC pipes began to be installed for residential drinking water distribution and waste pipelines (Germany). Most are still in service.
• 1949 – Initial use of PVC pipe in North America.
• 1952 – PVC pipe introduced in the U.S.
• 1955 – First PVC water distribution pipes laid in the U.S.
• 1960 – Original publication of ASTM D1785 – Standard Specification for PVC. Plastic Pipe, Schedules 40, 80, and 120.

专职外贸SEO

昨天网上熬夜很晚，找资料解决这个问题。后来用最简单的办法搞定。多简单？看看如下

找到.htaccess,然后把

# RewriteBase /

前的#去掉，就可以了。对我来说，OK