近距离封锁;
HARRIS BLOCKADE welding electrodes used by the U.S., with welded tube-free oxidation of skin, bite close, non-porous, never leaks and other characteristics;
采用美国HARRIS BLOCKADE焊条焊接,具有焊接管内无氧化皮、咬合紧密、无气孔、永不泄漏等优点;
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