单项选择题 Little Johnny felt the bag, curious to know what it ____.A.collectedB.containedC.loadedD.saved

单项选择题 What is a perpetuity? A、A perpetuity is a final annuity whose period is infinite. There is no future value for perpetuity. B、A perpetuity is an annuity whose period is infinite. There is no future value for perpetuity. C、A perpetuity is a final annuity whose period is infinite. There is no present value for perpetuity. D、A perpetuity is an annuity whose period is infinite. There is no present value for perpetuity.

判断题 灯光投射的方位包括灯具安装的文职、投光方向及角度。