热机包括内燃机,柴油机和汽油机都属于内燃机,关于热机的下列说法中正确的是( )
A:汽油机顶部有喷油嘴,柴油机顶部有火花塞
B:柴油机在吸气冲程中将柴油和空气的混合气吸入气缸
C:四冲程汽油机在工作过程中,进、排气门同时关闭的冲程是做功冲程和压缩冲程
D:在柴油机的压缩冲程中,机械能转化为柴油和空气混合物的内能
阅读下列短文,根据短文内容选择最佳答案.
Interesting festivals in the world
Throwing tomatoes﹣Spain(西班牙)
Spain takes "tomatoes fights" to a whole new level. But the tomatoes are being thrown, not eaten. The festival takes place during the last Wednesday in August. Trucks(卡车)carry tomatoes into the square. People rush to the tomatoes and throw them into the crowd.
Rolling cheese﹣England
This festival is celebrated on the last Monday in May. It takes place on Cooper's Hill. A large wheel of cheese(奶酪)is rolled down Cooper's Hill. The festival is actually a race where people run down the hill after the rolling cheese. The first person to cross the finish line at the bottom of the hill wins the cheese.
Burning man﹣The United States
The Burning Man Festival lasts a week, it is from the Monday before labor Day to Labor Day(which falls on the first Monday in September in America). The festival takes place in the Black Rock Desert. The best part of the festival is the burning of a large sculpture of a man.
Pouring water﹣Thailand
The Songkran Festival is the celebration of the New Year in Thailand. Rather than a single day. Thailand celebrates the New Year from April 13th to April 15th. Thai people run after each other pouring water. Songkran is one of the most important reasons why foreigners travel to the beautiful land.
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