题型:填空题 ---- Hi , Randall,Come on in .----Uh, yeah, I __________ by to see if you ___________ for a roommate to share your house.A.stopped; were still looking B.will stop ;are still lookingC.have stopped ; were still lookingD.stop ; will have looked 查看答案
题型:填空题 如图所示,长1.6m、粗细均匀的金属杆可以绕O点在竖直平面内自由转动,一拉力——位移传感器竖直作用在杆上,并能使杆始终保持水平平衡。该传感器显示其拉力F与作用点到O点距离x的变化关系如图所示。据图可知金属杆重 ( ) A.5 NB.10 NC.20 ND.40 N 查看答案