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问题 单项选择题

干选系统的停车顺序：原煤皮带输送机、给料机、（）、关闭总风门、引风机、袋式除尘器。

A、主风机、产品皮带机、干选机

B、主风机、干选机、产品皮带机

C、干选机、产品皮带机、主风机

D、干选机、主风机、产品皮带机

答案

参考答案：C

单项选择题

The swan is mostly silent through its life, unable to sing sweet songs like most other birds. In ancient times, however, people believed a swan sings a most beautiful song just before it dies. The ancient Greek philosopher Socrates talked of this 2,300 years ago. Socrates explained that the swan was singing because it was happy. The bird was happy because it was going to, serve the Greek God Apollo. Swans were holy to Apollo, the god of poetry and song.
The story of the swan’s last song found a place in the works of other writers, including the early English writers Chaucer and Shakespeare. And the expression swan song has long been a part of the English language. At first, "swan song" meant the last work of a poet, musician or writer. Now, it means the final effort of any person. Someone’s swan song usually is also considered that person’s finest work.
A political expression with a similar meaning is "the last hurrah". The expression may be used to describe a politician’s last campaign, his final attempt to win cheers and votes. The last hurrah also can mean the last acts of a politician, before his term in office ends. Writer Edwin O’Connor made the expression popular in 1956. He wrote a book about the final years in the political life of a long-time mayor of Boston. He called his book The Last Hurrah.
Some language experts say the expression came from a name given to noisy supporters of Andrew Jackson, America’s seventh president. They cheered hurrah so loudly for Andy Jackson during his presidential campaign that they became known as the hurrah boys.
Jackson’s hurrah boys also played a part in the election to choose the next president. Jackson’s choice was his vice president, Martin VanBuren. A newspaper of the time reported that VanBuren was elected president: "... by the hurrah boys, and those who knew just enough to shout hurrah for Jackson. " President Jackson really heard his last hurrahs in the campaign of the man who would replace him in the White House.

In ancient times, people believed that a swan sings most beautifully ______.

A. before death
B. when it is happy
C. for Apollo
D. in front of other birds
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单项选择题

挖土、打桩、地锚入土深度在（）米以上，地面堆放负重在50kg/m2以上；使用推土机、压路机等施工机械进行填平或平整场地的作业，称为动土作业。

A、0.6

B、0.5

C、1

D、1.2
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