Government officials visited the earthquake zone on Thursday morning to coordinate the relief effort.
政府官员星期四上午视察了地震灾区以协调救灾工作。
A pressure differential relief valve is located in a zone between the check valves.
压差安全阀位于止回阀之间的区内。
A pressure differential relief valve is located in a zone between the check valves.
压差安全阀位于止回阀之间的区内。
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