拉压杆的危险截面必为全杆中（）最大的横截面。
A.正应力
B.面积
C.轴力
D.弯曲应力
参考答案：A
把锐角、平角、钝角、直角、周角按下列顺序排列．______＞______＞______＞______＞______．
Suppose a treasury inflation protective security (TIPS) is currently trading at its par value of $100000, and has a 4 percent coupon rate paid semi-annually. If the annual inflation rate is 2.5 percent, what is the coupon payment after six months has passed（）
A. $2000.
B. $2025.
C. $2050.
