【单选题】If real GDP per person is growing at 4 percent per year, approximately how many years will it take to double?
【简答题】2 线控制,正反转运行,第 1 个速度为模拟电压信号(电源取自变频器 +10V 端,使用电位器调节)经 AI1 端子给定,其他速度为 20Hz 、 30Hz 、 40Hz 。升降速时间各为 5s 。需设置哪些参数?
【简答题】for peoblem 38, suppose that sales are expected to be 100 units in the first year and increase at a rate of 40 percent per year. how many years will it take to recoup the $30000 initial investment? as...
【简答题】According to the rule of 70, if $100,000 invested at 7 percent interest per year, how many years in approximately it will double in size?