So the instrument not only convenient for mineworker, but effective guarded against the fire damp explosion in practice ap...
在实应用中不但方便了井下工的随,而且有效地预防了安全事故的发生。
So the instrument not only convenient for mineworker, but effective guarded against the fire damp explosion in practice ap...
在实应用中不但方便了井下工的随,而且有效地预防了安全事故的发生。
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