矿井火灾是煤矿五大灾害之一，探测地下火源位置的问题在我国仍然是一项开放性的课题。

Mine fire is one of five big disasters in coal mine. The problem of probing underground fire source's position and limit is still an opening task in our country.

youdao

矿井火灾是煤矿五大灾害之一，探测地下火源位置的问题在我国仍然是一项开放性的课题。

Mine fire is one of five big disasters in coal mine. The problem of probing underground fire source's position and limit is still an opening task in our country.

youdao