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【单选题】
在混凝土外加剂中，关于泵送剂的说法，错误的是（ ）。A.
应用泵送剂温度不宜高于35℃
B.
掺泵送剂可能造成堵泵现象
C.
泵送混凝土水灰比为0．45～0．60，砂率38%～45%
D.
最小水泥用量应大于0．1 t/m3
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