We have a nice classroom. It’s one of ________ in our school.A. bigger classrooms B. biggest classroom C. the biggest classrooms D. the bigger classroom 答案:C你只要看看自己的身体就可以找到人体内的简单机械了,你的许多活动基本上是由杠杆操作的.请你找出身体上属于杠杆的两个部分,并分别说明是哪种杠杆.(1)部位:_____;杠杆类型;_____.(2)部位:_____;杠杆类型;_____.