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【多选题】
关于EDTA滴定法,说法正确的是( )。A.
每个样品搅拌的时间、速度和方式应力求相同，以增加试验的精度。
B.
做标准曲线时，如工地实际水泥剂量较大，素集料和低剂量水泥的试样可以不做，而直接用较高的剂量做试验，但两种剂量大于实用剂量，以及两种剂量小于实用剂量。
C.
配制的氯化铵溶液最好当天用完，不要放置过久，以免影响试验的精度。
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