全国2011年4月高等教育自学考试建筑工程概论试题_第7页

31.梁板式楼板主梁的经济跨度一般为(      )

A.3～5m                                                       B.4～6m

C.5～8m                                                        D.7～9m

32.下列楼梯中按用途划分的是(      )

A.室内楼梯                                                   B.双跑梯

C.室外消防梯                                                D.剪刀梯

33.楼梯平台宽度供单人通过时应不小于(      )

A.650mm                                                      B.750mm

C.850mm                                                       D.950mm

34.要使雨水容易排除，坡屋顶的坡度一般大于(      )

A.10％                                                          B.15％

C.20％                                                          D.25％

35.下列属于平屋面无组织排水的是(      )

A.槽沟外排水                                                B.女儿墙外排水

C.由屋檐自由落到室外地面                           D.内排水