第8题: [单项选择]{{B}}Passage One
Questions 26 to 28 are based on the passage you have just heard.
{{/B}} A. They were created by Galileo in 1610. B. They are electrical in nature. C. They are created by nature. D. They are there for almost thousands of years. 参考答案:B 答案解析:[听力原文]26-28
Astronomers are still learning about sunspots and about their effects on us, but bel
第9题: [单项选择]二氧化碳灭火系统按应用方式可分为()。 A. 组合分配灭火系统和单元独立灭火系统 B. 高压系统和低压系统 C. 管网灭火系统和无管网灭火系统 D. 全淹没灭火系统和局部应用灭火系统 参考答案:D