已知sinx=513,x∈(π2,π),求cos2x和tan(x+π4)值.

题型:解答题

问题:

已知sinx=
5
13
,x∈(
π
2
,π),求cos2x和tan(x+
π
4
)值.
考点:两角和与差的三角函数及三角恒等变换
题型:解答题

如图所示,在烧杯甲中装入蒸馏水,滴入2滴酚酞试剂,得到无色溶液.在烧杯乙中装入浓氨水.用一只大烧杯把甲、乙罩在一起.几分钟后,发现甲中的溶液变成红色.对上述现象的下列解释,其中正确的是 

(1)甲内滴入的酚酞变色过程缓慢,与乙无关;

(2)氨水能使酚酞溶液变红;

(3)大烧杯壁上沾有某种物质,散发出肉眼看不见的微粒与甲中的溶液接触,使其变红;

(4)乙内的浓氨水中有肉眼见不到的微粒逸出,有些微粒进入了甲中的溶液,使甲中的溶液变红.(  )

A.(1)(2)

B.(2)(3)

C.(2)(4)

D.(3)(4)

题型:解答题

E

A century ago in the United States, when an individual brought suit against a company, public opinion tended to protect that company. But perhaps this phenomenon was most striking in the case of the railroads. Nearly half of all negligence cases decided through 1896 involved railroads. And the railroads usually won.

Most of the cases were decided in sate courts, when the railroads had the climate of the times on their sides. Government supported the railroad industry; the progress railroads represented was not to be slowed down by requiring them often to pay damages to those unlucky enough to be hurt working for them.

Court decisions always went against railroad workers. A Mr. Farwell, an engineer, lost his right hand when a switchman’s negligence ran his engine off the track. The court reasoned that since Farwell had taken the job of an engineer voluntarily at good pay, he had accepted the risk. Therefore the accident, though avoidable had the switchmen acted carefully, was a “pure accident”. In effect a railroad could never be held responsible for injury to one employee caused by the mistake of another.

In one case where a Pennsylvania Railroad worker had started a fire at a warehouse and the fire had spread several blocks, causing widespread damage, a jury found the company responsible for all the damage. But the court overturned the jury’s decision because it argued that the railroad’s negligence was the immediate cause of damage only to the nearest buildings. Beyond them the connection was too remote to consider.

As the century wore on, public sentiment began to turn against the railroads—against their economic and political power and high fares as well as against their callousness toward individuals.

72. Which of the following is NOT true in Farwell’s case?

A. Farwell was injured because he negligently ran his engine off the track.

B. Farwell would not have been injured if the switchman had been more careful.

C. The court argued that the victim had accepted the risk since he had willingly taken his job.

D. The court decided that the railroad should not be held responsible.

73. What must have happened after the fire case was settled in court?

A. The railroad compensated for the damage to the immediate buildings.

B. The railroad compensated for all the damage by the fire.

C. The railroad paid nothing for the damaged building.

D. The railroad worker paid for the property damage himself.

74. The following aroused public resentment EXCEPT _____.

A. political power   B. high fares    C. economic loss   D. indifference

75. What does the passage mainly discuss?

A. Railroad oppressing individuals in the US.

B. History of the US railroads.

C. Railroad workers’ working rights.

D. Law cases concerning the railroads.

题型:解答题

甲公司于20×7年1月30日向乙公司购买原材料一批,2月1日开具一张出票日为2月1日、面值为234万元、期限为6个月的商业承兑汇票一张,并于当日转交给乙公司。至7月31日,甲公司因发生财务困难无款支付。8月10日,甲公司与乙公司达成如下债务重组协议:
甲公司以其生产的产品(适用增值税税率17%、消费税税率10%)一批和一项无形资产抵偿所欠债务134万元。在重组日,产品账面成本为45万元,计税价格(公允价值)为50万元,未计提减值准备;无形资产账面余额为60万元,累计摊销10万元,公允价值为50万元,适用营业税税率5%,未计提减值准备。同时乙公司豁免甲公司债务本金50万元,并将剩余债务延期至20×9年12月31日偿还,并从20×8年1月1日起按年利率2%计算利息。但如果甲公司20×8年起年实现利润总额超过100万元则年利率上升至4%。利息于债务结清时一并支付。不考虑债务重组过程中的其他相关税费。
乙公司至8月10日未对该项债权计提坏账准备。乙公司将收到的甲公司的产品作为库存商品管理(收到相应的增值税专用发票并通过税务机关的审核、认证);将收到的甲公司的无形资产作为无形资产管理,并估计其受益期间为50个月。
根据上述资料,回答下列问题:

甲公司因该项债务重组业务而确认的债务重组利得为( )万元。

A.69

B.71.5

C.72.5

D.80

题型:解答题

保证锅炉安全运行的三大安全附件水位计,其中双色水位计是利用水和蒸汽具有不同的折射率,并在水和玻璃界面、蒸汽和玻璃界面具有不同的全反射角的原理。

题型:解答题

关于联动试运行的安全要求,以下正确的是()

A、试运行人员必须按建制上岗,服从统一指挥

B、必须按照试运行方案及操作规程精心指挥和操作

C、联动试运行前应划定试运行区域,无关人员不得进入

D、不受工艺条件影响的仪表、保护性联锁、报警皆不应参与试运行

更多题库