毒蛇咬伤的特异性药物() A.抗生素 B.抗蛇毒血清 C.氢化可的松 D.抗组胺剂 发布时间:2017-09-04 03:07 │ 来源:www.tikuol.com 题型:单项选择题 问题: 毒蛇咬伤的特异性药物()A.抗生素B.抗蛇毒血清C.氢化可的松D.抗组胺剂E.地西泮
题型:单项选择题 — I rang you at about nine, but there was no reply.— Oh, that was probably________I was seeing the doctor. [ ]A. why B. whenC. what D. that 查看答案
题型:单项选择题 如图所示,物体G在拉力F的作用下作匀速直线运动,拉力所做的功是600J,物体向左移动了2m,滑轮组的机械效率是80%,求: (1)额外功是多少? (2)拉力F是多少?(3)物体所受的摩擦力是多大? 查看答案