Exclusive metal thermo-block with double thermostatic control and safety thermo-fuse.
独家金属热块双恒温控制和安全热保险丝。
The line block valves are of vital importance for the safety operation of the pipeline.
线路截断阀是管道安全运行的重要保证。
The line block valves are of vital importance for the safety operation of the pipeline.
线路截断阀是管道安全运行的重要保证。
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