水具有反常高的沸点,主要是因为分子间存在 ___________。

题型:填空题

问题:

水具有反常高的沸点,主要是因为分子间存在 ___________。

考点:氢键
题型:填空题

特种劳动防护用品必须具有“三证”和“一标志”,即生产许可证、产品合格证、( )和安全标志。

A.安全等级

B.安全鉴定证

C.安全评价人员资格证书

D.安全技术证

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The Dreadlock Deadlock
In the fall of 1993 Christopher Polk transferred from FedEx’s hub in Indianapolis to take over a delivery route in Flatbush District, Brooklyn, N.Y. But moving to the country’s largest community of Caribbean and African immigrants only precipitated a far more profound journey. "I was becoming culturally aware of the history of the black people," says Polk, now 31, "and that gave me these spiritual questions." His answer came providentially, by way of a music video featuring Lord Jamai, who raps about the Rastafarian belief in the sanctity of dreadlocks —the cords of permanently interlocked strands first worn by African chiefs perhaps 6,000 years ago.
Now a practicing Rastafarian, Polk sports thick garlands that gently cascade onto his shoulders. "Your hair is your covenant," he says. "Once you grow your locks, it puts you on a path."
Unfortunately, that path was a collision course with Federal Express’s grooming policy, which requires men to confine their dos to "a reasonable style". After years of deliberation, Polk’s bosses gave him a choice: shear his locks or be transferred to a lower-paid job with no customer contact. He refused both options and was terminated in June 2000.
His tale is not unique. Although Rastafarians number about 5,000 nationally, today dreadlocks, twists or braids are at the height of fashion, nearly as common as Afros were 30 years ago. If Afros symbolized militancy, dreads signal a more spiritual self-declaration, a figurative locking with African ancestors. As Stanford professor Kennell Jackson, who teaches a course called "African Coiffures and Their New World Legacies" puts it, "There’s a divinity to these locks."
Divine or not, some employers consider them unacceptably outré. Six other New York-area FedEx employees have lost their jobs because of dreadlocks. They have sued, alleging religious discrimination; the U.S. Equal Employment Opportunity Commission and New York’s attorney general have also charged FedEx with violating religious protections in the Civil Rights Act.
The dreadlock deadlock may be easing. FedEx altered its policy slightly a few weeks ago: in the future, observant employees who seek a waiver may wear their locks tucked under uniform hats, says a company spokeswoman. The concession isn’t enough to settle the lawsuits yet. The EEOC also wants reinstatement for the fired drivers, says trial attorney Michael Ranis. He’s optimistic. Some new styles, he knows, grow more appealing over time.

题型:填空题

新生儿由风疹病毒感染所致的常见先天畸形不包括()

A.先天性心脏病

B.神经系统异常(小头畸形,智力低下)

C.先天性白内障

D.肺纤维囊性变

E.耳聋

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收受定金的一方不履行约定的义务,应当()。

A.返还定金 

B.返还定金,并支付定金20%的违约金 

C.返还定金,并支付定金30%的违约金 

D.双倍返还定金

题型:填空题

制定教育发展战略有多种方法,其中,估计各种教育投资对于经济发展的作用和贡献,并把它作为分配教育经费的参照系,规划教育整体及各级各类教育的发展状态的方法是()

A.国际比较法

B.人才需求预测法

C.教育投资效益分析法

D.社会需求法

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