In the complete darkness, she began ___ 发布时间:2017-04-25 02:05 │ 来源:www.tikuol.com 题型:选择题 问题: In the complete darkness, she began ___ afraid.A.to feelB.feelingC.to feelingD./
题型:选择题 If anybody calls, tell them I'm out, and ask them to _____ their name and address. [ ]A. pass B. write C. take D. leave 查看答案
题型:选择题 Those who suffer from headache will find they get ________ from this medicine.[ ]A.relief B.safetyC.defense D.shelter 查看答案
题型:选择题 (10分)在水平地面上放一木板B,重力为G2=100N,再在木板上放一货箱A,重力为G1=500N,设货箱与木板、木板与地面的动摩擦因数μ均为0.5,先用绳子把货箱与墙拉紧,如图所示,已知sinθ=3/5,cosθ=4/5,然后在木板B上施一水平力F,想把木板从货箱下抽出来,F至少应为多大? 查看答案