题干

汽车是常见的交通工具,它应用了很多方面的物理知识和技术,它在给我们带来交通便利的同时,也给我们带来了环境污染、交通安全等一些社会问题.请你运用所学的物理知识简要回答下列问题:

(1)汽车发动机的冷却剂常选用水的主要原因.

(2)油罐车运输时为什么在地上拖一条铁链?

上一题 下一题 0.0难度 选择题 更新时间:2019-07-10 02:09:30

答案(点此获取答案解析)

答:(1)由于水的比热容大,吸收相同的热量,水的温度升高量小,因此汽车发动机的冷却剂常选用水.

(2)油罐车在运输过程中,与周围的空气不断摩擦,使油罐车带上静电,油罐车带电后,容易发生放电现象而发生火灾,因此油罐车运输时地上拖一条铁链,以便把静电及时导走,避免发生危险.

同类题4

阅读下面短文内容,然后根据短文内容完成表格,每空一词。

    Mayme Clayton collected books, magazines and letters written by African Americans. Her son, Avery Clayton, thought her collection was important. Unlike most books, these were rare and hard to find. They were written by writers who helped shape African American culture.

    One book in the collection was written by Phillis Wheatley. Wheatley was a slave who wrote poetry. She was the first African American to publish a book. Wheatley herself signed (签名) the book in the Claytons' collection. No one else owns a copy signed by Phillis Wheatley.

    By the time she passed away at age 83, Mrs. Clayton had more than 30,000 books by or about black people. Her collection also includes papers about slaves, photographs, movies, sheet music, and personal letters by black leaders and artists. It is one of the biggest personal collections of African American history and culture in the United States.

    Avery Clayton's dream was to create a museum for his mother's treasures.  Scholars say that Mrs. Clayton's collection is very important. Without her work, part of African American heritage (遗产) would have been lost. "We didn't know these things existed," says Sara Hadron of California's Huntington Library.

    The collections new home is likely to be in Culver City, California. Part of Avery Clayton's dream is to share the cultural riches his mother collected with others. He especially wants children to have a chance to see the collection. " At present African American culture is being explained by pop culture," he says, " It's important to offer a more complete picture."

Mayme Clayton and Her Collection

Personal information

● She liked ____ books, magazines and letters written by African Americans.

●She ____ when she was 83years old.

Her collection

● Compared with other books, the books she collected couldn't be found ____.

● The only copy ____ and signed by Phillis Wheatley was in her collection.

● She had a large collection, ____ books, paper, photographs and other things by black leaders and artists.

● Her collections is ____ to African American history and culture.

Her ____ dream

● A ____ for the treasure would be created.

● He hopes to ____ the culture riches collected by his mother with more people, especially ____.