一个钝角减去一个直角，得到的一定是锐角．______．（判断对错）
一个钝角减去一个直角，得到的一定是锐角是正确的；
故答案为：√．
Consider a 1-year quarterly-pay $1000000 equity swap based on 90-day London Inter-bank Offered Rate (LIBOR) and an index return. Current LIBOR is 3.0 percent and the index is at 840. Below are the index level and LIBOR at each of the four settlement dates on the swap.（）
A.Q1
B.Q2
C.Q3
D.Q4
表示物种Ⅰ和物种Ⅱ是捕食者与被捕食者关系的图是[ ]
A．
B．
C．
D．
