题型:问答题 简答题 I can still remember, ________it was so long ago.[ ]A. ever since B. now thatC. even though D. even as 查看答案
题型:问答题 简答题 如图所示,小车同时受到甲水平推力100N和乙水平拉力80N 的作用,在50s 内向前运动了70m. 小车受到这两个力的合力是__________N ,甲对车做功的功率是 ____________W. 查看答案