题目内容
配气机构按照发动机的工作循环和点火顺序的要求，定时开启和关闭各气缸的进、排气门，使新鲜的可燃混合气或空气及时进入气缸，废气及时从气缸排出。在压缩与做功冲程中，关闭气门保证燃烧室的密封。
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France was the center of Europe prior to the French Revolution.
The liberal ideas of French revolutionaries were borrowed not only from the eighteenth-century philosophes, but also from the North American revolutionaries.
Before the French Revolution, the only social class that supported absolutism was the aritocrats.
American Revolution was the first of a series of conflicts over colonial control of the New World.
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