16.1 Water circulates through the hydrologic cycle (水文循环) The Earth's water is constantly circulating, powered by the heat of the sun and the force of gravity. Water evaporated from ocean precipitates(降水) into the ocean: direct route. Water evaporated from ocean is blown by winds until it is over the land and precipitates: (1) evaporates beck into atmosphere, (2). Infiltrate

外研版（三起）（2012）小学英语六年级下册Module 3 Unit 2 The cows are drinking water.Module 3 Unit 2 The cows are drinking water.习题

外研版（三起）（2012）小学英语六年级下册Module 3 Unit 2 The cows are drinking water.Module 3 Unit 2 The cows are drinking water.教案(2)

外研版（三起）（2012）小学英语六年级下册Module 3 Unit 2 The cows are drinking water.Module 3 Unit 2 The cows are drinking water.教案(4)

外研版（三起）（2012）小学英语六年级下册Module 3 Unit 2 The cows are drinking water.Module 3 Unit 2 The cows are drinking water.教案(6)

外研版（三起）（2012）小学英语六年级下册Module 3 Unit 2 The cows are drinking water.Module 3 Unit 2 The cows are drinking water.教案(8)

外研版（三起）（2012）小学英语六年级下册Module 3 Unit 2 The cows are drinking water.Module 3 Unit 2 The cows are drinking water.教案

外研版（三起）（2012）小学英语六年级下册Module 3 Unit 2 The cows are drinking water.Module 3 Unit 2 The cows are drinking water.课件(2)

外研版（三起）（2012）小学英语六年级下册Module 3 Unit 2 The cows are drinking water.Module 3 Unit 2 The cows are drinking water.课件(5)

水准测量原理 The Principle of Leveling 水准仪及其使用 The Water Level and the Usage 水准测量的一般方法和要求 The Common Methods and Demand of the Water Level 水准仪的检验和校正 The Inspection and Emendation of the Water Level 水准测量误差产生的原因及消减方法 The Causes and Elimination of Leveling