原始凭证可以提供经营管理所需的总量指标，是具有法律效力的证明文件，因此它是进行会计核算的重要原始依据。()
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The author believes that industry avoids salty water because______.
A. water is needed for livestock
B. crops must be considered before man-made products
C. it is used in desalinization plants
D. it causes corrosion
The author of this text states that______.
A. the problem of obtaining good drinking water has plagued man throughout time
B. palatability is synonymous with purity of water
C. most of the world"s water is unusable as a water supply
D. man no longer depends on desalinization for his water supply
从度量机制方式划分，路由协议可以分为链路状态协议和距离向量协议。()
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