单项选择题
A.水泥加水搅拌时 B.胶砂搅拌结束时 C.装模并抹面时 D.试体放入湿气养护箱时
A.1%-3% B.3%-5% C.8%-10% D.3%-6%
A.4% B.5% C.6% D.7%
A.1Mpa B.0.5Mpa C.0.1Mpa D.0.2MPa
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