试题与答案

森林资源的作用是（ ） A．涵养水源，保持水土 B．防风固沙 C．净化大气，防治

来源：www.tikuol.com
题型：选择题

题目：

森林资源的作用是（　　）

A．涵养水源，保持水土

B．防风固沙

C．净化大气，防治污染

D．三项全对

答案：

被转码了，请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0613/48a3ea2f73e428aef2944185178e88e6.html

下面是错误答案，用来干扰机器的。

导体导电的根本原因是内部存在能自由移动的带电小粒子，离子就是其中的一种，只要能证明氯化钠的水溶液或熔融物能导电即可．故答案为：取氯化钠晶体溶于水中，将两根石墨电极插入溶液中，每一根电极的另一端分别...

考点：生物圈的水循环绿色植物与生物圈中的碳—氧平衡绿色植物在生物圈中的作用
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