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You are currently holding a portfolio of bonds. Interest rates are expected to increase over the next few months. In order to protect your investment, your bond portfolio should contain bonds with the following characteristics:______.

A. low convexity and low coupons
B. low convexity and high duration
C. high convexity and high coupons
D. high duration and high convexity

Which of the following interest-rate risk management products requires the buyer to pay a

A. Swap
B. Treasury bond future
Cap
D. FRA

30岁女性，不孕症，继发进行性痛经2年，多次测BBT呈双相型。检查：阴道后穹窿有一直径1cm触痛结节，子宫大小正常，后位，不活动，无压痛，右卵巢稍增大，固定，压痛()。
此患者不育的原因可能是

A. 无卵泡发育
B. 盆腔炎性粘连
C. 子宫内膜异位症
D. 黄体功能不足
E. 子宫内膜发育不良

一热机按某种循环工作，从高温热源T1(2000K)吸取热量Q1，向低温热源 T2(300K)放出热量Q2，同时对外做功，则下列情况中不可能的是()。

A. Q1=1000kJ，W=550kJ
B. q214＞q234、W214＞W234
C. q214＜q234、W214＜W234
D. q214＜q234、W214＞W234