题型:名词解释 Li Ping was born_________ .A.in the year 1984,at 10 a.m.on June 18thB.on June 18th at 10 a.m.in the year 1984C.at 10 a.m.in the year 1984 on June 18thD.at 10 a.m.on June 18th in the year 1984 查看答案
题型:名词解释 如下图所示,在水平面ABC中,AB段光滑,BC段粗细,且AB=BC=20m,用10N的水平恒力F推着100N的重物,由A点运动到C点,在AB段、BC段上推力做的功分别为W1、W2,则W1、W2的大小关系是 A. B. C. D.无法确定 查看答案