A:pass
B:past
C:passing
D:passed
如图所示,搬运工人用滑轮组提升重540N的物体,所用拉力F为200N,物体以0.2m/s的速度匀速上升了10秒,(不计绳重,绳与滑轮的摩擦)求:
—The Dragon Boat Festival is coming. I'm going to give a talk about it to the exchange students.
— Great! But don't forget to tell them _________.
把14、33、35、30、39、75、143、169八个数平均分成两组使每组四个数的乘积相等.