The initial setting time of Portland cement shall not be earlier than 45 minutes, final set time not later than 390 minutes.
硅酸盐水泥的初凝时间不得早于45分钟，终凝时间不得迟于390分钟。
The initial setting time of Portland cement shall not be earlier than 45 minutes, final set time not later than 390 minutes.
硅酸盐水泥的初凝时间不得早于45分钟，终凝时间不得迟于390分钟。
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