单项选择题
A.1m B.3m C.5m D.7m
A.5~7d B.10~14d C.15~25d D.30~50d
A.0.5d B.0.5~1.0d C.1.0~1.5d D.1.5~2.0d
A.水泥砂浆B.混合砂浆C.石灰砂浆D.石膏砂浆
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