USES material not qualified. Such as sand, stone, aggregate quality unqualified; In addition, mostly because cement volume expansion rate is too large (stability serious adverse).
所用材料不合格。如砂、石、集料质量不合格;除此之外,大多数是因为水泥体积膨胀率太大(安定性严重不良)。
If the ball makes no sense to try to clean up in time to plug the pipe material and re-testing until qualified so far.
若试球不通的,要及时清理管道的堵塞物并重新试验,直到合格为止。
Unshaped active carbon produced through water steaming method with qualified coal as raw material. The products of these are easy in reproduction and strong against pressing.
以优质煤为原料,用水蒸汽法生产的不定型活性炭,具有一定抗压强度,易再生。
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