A.45° B.90° C.135° D.180°
A.97% B.96% C.95% D.结果无效，应重做
A.1 B.2 C.3 D.4
A.初步配合比 B.基本配台比 C.试验室配台比 D.工地配合比
A.12mm B.15mm C.18mm D.25mm
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