單項(xiàng)選擇題
A.1 B.2 C.3 D.4
A.20B.40C.50D.100
A.90% B.80% C.70% D.60%
A.100 B.300 C.50 D.150
A.56 B.66 C.76 D.86
A.國(guó)家規(guī)范規(guī)定B.設(shè)計(jì)要求C.地方標(biāo)準(zhǔn)D.無(wú)要求
A.1/1000 B.3/1000 C.1/1000~3/1000 D.L/1000
A.200mm B.300mm C.400mm D.500mm
A.60mmB.55mmC.50mmD.65mm