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【单选题】
丙类火具有的特点是()A.
直线与表面燃烧
B.
容易复燃
C.
易燃易爆性大
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【简答题】The English language started with the invasion of Britain by three Germanic tribes during the 5th century AD, and they contributed greatly to the formation of the English language.
【简答题】In the 5 th century, three Germanic tribes invaded Britain and they became the ancestors of the English of today. These three tribes are the Angels, the Saxons, and the _______. Collectively, they are...
【简答题】下图是人体呼吸全过程图解，请据图填空。 (1)图中①-④分别表示呼吸过程中的哪一个环节？①_____②______③_____④______。 (2)一氧化碳中毒是因为____过程发生障碍引起的。 (3)①过程是通过____完成的，②和④过程是通过______完成的。 (4)血液经过②过程中，由_____变成______。血液由______变成_______。
【简答题】At the beginning of the 5 th century, with the end of the Roman occupation, Britain was invaded by three tribes from Northern Europe: the Angles, Saxons and Jutes. Language spoken by them is called __...
【单选题】The history of the English language really started with the arrival of three Germanic tribes who invaded Britain during the 5th century AD. Which one is not among the three tribes?
A.
the Saxons
B.
the Celtics
C.
the Jutes
D.
the Angles
【简答题】描述呼吸运动的概念及过程。 （1）概念：指人体 有节律地 和 的运动，包括 过程和 过程。 （2）过程 ①吸气过程 ②呼气过程 （3）结果：完成了肺与外界环境之间的气体交换。 思考：会游泳的同学可能有这样的体会，刚下水时，如果水超过胸部，你会感到呼吸有些吃力。这是为什么呢？
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