单项选择题
A.10% B.15% C.20% D.25%
A.1：3，1.0 B.1：4，0.5 C.1：3，0.5 D.1：4，1.0
A.50N/s±10N/s B.100N/s±10N/s C.2500N/s±200N/s D.2400N/s±200N/s
A.5mm B.10mm C.15mm D.20mm
A.10kg/m3 B.20kg/m3 C.30kg/m3 D.40kg/m3
A.0.7~1.1 B.0.75~1.15 C.0.8~1.2 D.0.85~1.25
A.15s B.30s C.45s D.60s
A.30天 B.60天 C.3个月 D.6个月
A.管理水平 B.施工水平 C.试验水平 D.材料优劣
A.90s B.120s C.150s D.180s
A.70~90mm B.30~50mm C.40~60mm D.60~80mm