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【简答题】背景材料： 南方某特大桥，主梁为预应力混凝土连续箱梁，采用WDJ碗口式钢支架施工，箱梁棍凝土强度C50，配合比为：水泥；砂：石：水：外加剂＝470:700:1055:190:9.5，坍落度14～16cm，第一段箱梁底腹板混凝土浇筑完成后，拆除内模时发现箱梁腹板内侧出现竖向构造裂缝。 问题： 防止钢筋混凝土结构出现构造裂缝的措施有哪些?
【单选题】根据ANOVA表,请判断上述b处分别应填入何数字? Source df ss ms f Factor 5 43.25 8.65 c Error a 256.50 b total 19 299.75
A.
b=13.5
B.
b=19.73
C.
b=18.32
D.
b=17.1
【简答题】南方某特大桥,主梁为预应力砼连续箱梁,采用WDJ碗口式钢支架施工，箱梁砼C50,配合比为水泥:砂:石:水:外加剂=470:700:1055:190:9.5,塌落度14～16cm,第一段箱梁底腹板砼浇筑完成后,拆除内模时发现箱梁腹板内侧出现竖向构造裂缝。 [问题] 防止钢筋砼结构出现构造裂缝的措施有哪些？
【单选题】Mortgage - backed securities
A.
have been growing in popularity in recent years as institutional investors look for attractive investment opportunities.
B.
are securities collateralized by a pool of mortgages.
C.
are securities collateralized by both insured and uninsured mortgages.
D.
are all of the above.
E.
are only A and B of the above.
【单选题】Securities dealers _________
A.
sell securities out of their inventories to customers who want to buy.
B.
buy securities, which they add to their inventories, from customers who want to sell.
C.
are largely responsible for the health and growth of small businesses in the United States.
D.
do all of the above.
E.
do only A and B of the above.
【单选题】Which of the following is true of secondary securities?
A.
They include equities, bonds, and other debt claims.
B.
They are backed by the real assets of corporations issuing them.
C.
They are securities backed by primary securities.
D.
They are securities issued by FIs.
E.
They must be placed in a separate account on order for primary securities to be offered.
【简答题】在8度抗震设防区，某房屋总高度不超过24m，丙类建筑，设计配筋砌砌体剪力墙中，下述抗震构造措施中，何项不妥?说明理由。 提示：剪力墙的压应力大于0.5fg。 (B)剪力墙一般部位水平分布筋的最小配筋率0.11% (C)剪力墙连梁水平受力筋的含钢率不宜小于0.4G (D)剪力墙砌体柱的纵向钢筋的配筋率不应小于0.4%
【简答题】连梁配筋构造措施
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