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1, the volume is enough, the cement bag is very full, almost no collapse. It
2. Put a little cement in a disposable cup and mix it with water. After standing for 6 hours, stick it with your hand and twist it. If you can't twist it, it's good cement. It
3, the quality of cement that is still not solidified for more than 12 hours is of poor quality. If the worker tells you that tiles a day ago can still be removed and replaced, then the quality of this cement must be very good.