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建筑排水系统常用的管材有哪些？各有什么特点？

答案

参考答案：

排水UPVC管排水UPVC管具有塑料管质轻、水力条件好、便于运输安装的优点，。

缺点是耐温的能力较差，容易老化；轴向线性变形较金属管显著；另外强度较金属管差；高层抗震的能力也相对较弱

单项选择题

有关胸内压的叙述，错误的是（）

A.一般情况下是负压

B.胸内压=肺内压-肺回缩力

C.胸内负压有利于静脉回流

D.使肺维持一定的扩张程度

E.产生气胸时负压增大
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单项选择题

Sometimes floating rate issues have caps and/or floors, which limit the maximum or minimum coupon rate that the issue will pay. Which of the following statements is TRUE with regard to floating rate issues that have caps and floors（）

A. A floor is a disadvantage to both the issuer and the bondholder while a cap is an advantage to both the issuer and the bondholder.

B. A floor is an advantage to both the issuer and the bondholder while a cap is a disadvantage to both the issuer and the bondholder. 

C. A cap is a disadvantage to the bondholder while a floor is a disadvantage to the issuer.
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