A:促进了农业经济的繁荣
B:增强了明清时期的国力
C:丧失了发展经济的最好机遇
D:导致了科学技术的落后
将角α的终边顺时针旋转π2,则它与单位圆的交点坐标是 ()
7.4646……的简便写法是7.46.
—Would you like something to drink, Tina?—Yes. Some please.