下列哪一征象是血管瘤的MRI表现（）
A.牛眼征
B.灯泡征
C.靶征
D.爆米花状染色
E.胡椒盐征
参考答案：B
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.
视距测量有视距常数不准确引起的误差，竖直角观测误差引起的误差，标尺倾斜引起的误差，标尺读数不正确引起的误差等。
