能实现控制阀气路切换,保证阀门在系统故障或接受到规定信号后能处于希望的安全位置的是(

题型:单项选择题

问题:

能实现控制阀气路切换,保证阀门在系统故障或接受到规定信号后能处于希望的安全位置的是()。

A.阀门定位器(或电气阀门定位器)

B.气动保持器

C.电磁阀

D.气动继动器

考点:仪表工考试高级化工仪表维修工高级化工仪表维修工题库
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A是B的倒数,把A的小数点向左移动一位后得0.25(    ),A与B的比值是(    )。

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宋明帝刘彧被前废帝刘子业戏称()王。

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个体应用日常和应对技巧与解决问题的技术来维持自我与环境间的稳定状态称为()

A.危机前的潜伏阶段

B.危机前的平衡阶段

C.危机的产生

D.危机的发展

E.危机后平衡状态的变化

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 第一篇 Is the Tie a Necessity?  Ties, or neckties, have been a symbol of politeness and elegance in Britain for centuries. But the casual Prime Minister Tony Blair has problems with them. Reports suggest that even the civil servants may stop wearing ties. So, are the famously formal British really going to abandon the neckties Maybe. Last week, the UK’s Cabinet Secretary Andrew Turnbull openly welcomed a tieless era. He hinted that civil servants would soon be tree of the costliest 12 inches of fabric that most men ever buy in their lives.  In fact, Blair showed this attitude when he had his first guests to a cocktail party. Many of them were celebrities (知名人士) without ties, which would have been unimaginable even in the recent past.For some more conservative British, the tie is a must for proper appearance. Earlier, Labor leader Jim Callaghan said he would have died rather than have his children seen in public without a tie. For people like Callaghan, the tile was a sign of being complete, of showing respect. Men were supposed to wear a tie when going to church, to work in the office, to a party - almost every social occasion.But today, people have begun to accept a casual style even for formal occasions.  The origin of the tie is tricky. It started as something called simply a "band". The term could mean anything around a man’s neck. It appeared in finer ways in the 1630s. Frenchmen showed a love of this particular fashion statement. Their neckwear (颈饰)impressed Charles II, the king of England who was exiled(流放)to France at that time. When he returned to England in 1660, he brought this new fashion item along with him.It wasn’t, however, until the late 18th century that fancy young men introduced a more colorful, flowing piece of cloth that eventually became known as the tie. Then, clubs military institutions and schools began to use colored and patterned ties to indicate the wearer’s membership in the late 19th century. After that, the tie became a necessary item of clothing for British gentlemen.  But now, even gentlemen are getting tired of ties. Anyway, the day feels a bit easier when you wake up without having to decide which tie suits you and your mood.

Which of the following is NOT a social occasion

A.Going to church.

B.Going to work in the office.

C.Staying at home.

D.Going to a party.

题型:单项选择题

冯雪峰、应修人、潘谟华等人创立()诗社。

A.九叶

B.未名

C.沉钟

D.湖畔

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