5.… even though fixing water would help our energy, defense, and health problems. (Para. 9)
A. … even though solving the water problem would help solve energy, defense and health problems.
B. … even though using water in an economical way would help solve energy, defense and health problems.
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数据结构主要研究非数值计算的问题。（）
A. 对
B. 错
习近平总书记在党的十九大报告中提出：中国特色社会主义进入了新时代。这个新时代是（）（）（）（）（）
1126.八缸活塞式制冷压缩机通常有_________个曲柄，彼此曲拐夹角为_________。
A. 4，90°
B. 2，90°
C. 2，180°
D. 8，45°
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