人教版《小学英语》家庭作业同步配套教学课件（五年级上册）Unit 3 What would you like？_Part B Let’s learn & Look, write and say

Introduction: What Is Mineral? Mineral Naturally formed, inorganic, solid material with a specific chemical composition and a characteristic crystalline structure. Rock Naturally formed, coherent mass of one or more minerals, sometimes including organic debris

人教版《小学英语》家庭作业同步配套教学课件（五年级上册）Unit 3 What would you like？_Part A Let’s spell

人教版《小学英语》家庭作业同步配套教学课件（五年级上册）Unit 3 What would you like？_Part A Let’s learn & Role-play

人教版《小学英语》课堂练习同步配套教学课件（三年级下册）Unit 3 At the zoo_Part B Start to read & Let’s check

人教版《小学英语》课堂练习同步配套教学课件（三年级下册）Unit 3 At the zoo_Part B Let’s talk & Make a monster

习题18-3 解:火车的固有长度为l=300m火车速度为v=100(km.h-)=250/9(m.s)

人教版《小学英语》课堂练习同步配套教学课件（三年级下册）Unit 3 At the zoo_Part A Let’s talk & Draw and say

人教版《小学英语》课堂练习同步配套教学课件（三年级下册）Unit 3 At the zoo_Part A Let’s spell

例1一飞轮半径为0.2m、转速为150rmin-1,因 受制动而均匀减速,经30s停止转动.试求:(1) 角加速度和在此时间内飞轮所转的圈数;(2)制动开 始后t=6s时飞轮的角速度;(3)t=6s时飞轮边缘 上一点的线速度、切向加速度和法向加速度