三相异步电动机旋转磁场的方向由（）决定，改变（）就可改变三相异步电机的转向。
参考答案：电源的相序；旋转磁场的方向
Play being recognized as an important factor improving mental and physical health and thereby reducing human misery and poverty.
A．By recognizing play as
B．Their recognizing play as
C．Recognition of it being
D．Play is recognized as
哪一种药不属于SSRIs（）
A.氟西汀
B.帕罗西汀
C.氯米帕明
D.舍曲林
E.氟伏沙明
