单项选择题
A.2mm B.4mm C.6mm D.8mm
A.1mm B.2mm C.3mm D.4mm
A.用2m靠尺和楔形塞尺检查 B.用水准仪检查 C.尺量检查 D.拉5m线和尺量检查
A.5mm B.8mm C.10mm D.15mm
A.2mm B.3mm C.4mm D.5mm
A.单层单向 B.单层双向 C.双层双向 D.双层单向
A.一点二线 B.一点三线 C.一点四线 D.一点五线
A.20MPA B.30MPA C.40MPA D.50MPA
A.6cm B.7cm C.8cm D.9cm
A.50% B.60% C.70% D.80%