hard metal alloy造句怎麼寫

The technology of developing quality and strong pick is found by researching the hard metal alloy, pick-body material, weld gap, technique of braze welding and heat treatment.

renewed technology of hard metal alloy mould

We must first clear of the old line, when constructed line, motor drive the cutter made of hard metal alloy to revolve at high speed, then erase old line.