These projects are all performed by foreign companies or under foreign specialist and expert site supervision of installation before.
在此之前，这些工程均为国外公司及专家直接负责或指导安装。
These projects are all performed by foreign companies or under foreign specialist and expert site supervision of installation before.
在此之前，这些工程均为国外公司及专家直接负责或指导安装。
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