A.16mm B.18mm C.19mm D.20mm
A.120mm B.150mm C.160mm D.180mm
A.不應(yīng)大于建筑物的層高,且不應(yīng)大于4mB.應(yīng)等于建筑物的層高,且不應(yīng)大于4mC.不應(yīng)大于建筑物的層高,且不應(yīng)大于6mD.不應(yīng)大于建筑物2層層高,且不應(yīng)大于10m