When all the top soil is gone, nothing remains but worthless desert. 1. Trees are useful to man mainly in three ways, the most important of which is that they can . A. keep him from the hot sunshine B. protect him from drought and floods C. make him draw quick profit from them D...
When all the top soil is gone, nothing remains but worthless desert. 【1】Trees are useful to man mainly in three ways, the most important of which is that they can . A. keep him from the hot sunshine B. protect him from drought and floods C. make him draw quick profit from them ...
Pure imported materials of key parts with advanced heat treatment technology, ensuring firmness and wear-resistance Unique grid structure reduces fuel consumption and power, enhances turning effect, and increases broken soil ratio Easy disassembly and adjustment of small complex ...
In this book the view is taken that the permafrost-affected soil is comprised of three parts: the active layer, the transition layer, and the permafrost layer. Soil formation is especially pronounced in the active layer but also occurs in the transition from warmer periods. The active layer ...
Function of DISC HARROW LF-BQX Series Light Duty Offset Disc Harrow is designed specially for small land with steep slopes that is difficult to harrow. The disc harrow is used for breaking up the ground, shattering soil lumps and mixing crop residues into soil as green manures. T...
1.根据Trees are useful to man in three important ways: they give him wood and other useful things, they give him cool places, and they help to stop droughts and floods.以及Unluckily, in many parts of the world, man has not found that the third of these points is the most important.可...
The results are even more serious: For where there are trees, their roots (根) prevent the rain from washing away the soil (土壤), but there are no trees, the rain ___ (fall) on hard ground and flows away, causing floods and carrying away the rich top-soil (地表土). When all ...
This does not only mean that man will have fewer trees.The results are even worse:for where there are trees,their roots break up soil---make the rain in---and also bind the soil,thus stopping it from being washed away easily; but where there are no trees,the rain falls on hard grou...
When all the top-soil is gone, nothing remains but worthless desert. Two thousand years ago a rich and powerful country cut down its trees to build warships, with which to gain itself an empire. It set up the empire but, without its trees, its soil became poor and it grew weak. When...
1LY series Disc plough is composed with 3 point mounted plough frame ,disc assembly,etc.This plow to be connected and mounted joining with the tractor ,while working the disc of the plow rotary motion and then plough the soil.it has the following advantages better than p...