During the early years of this century，wheat was seen as the very lifeblood of Western Canada.（语法上正确与否）

高压直流输电主要用于什么方面？高压输电有什么特点？ 点击查看答案

财务评价基本报表分为几类？（）

A.3
B.4
C.6
D.5

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