甲公司发行面值为1000元的10年期债券,债券票面利率为8%,半年付息一次,发行后在二级市场上流通,假设必要投资报酬率为10%并保持不变,下列说法正确的是()。
A. 债券溢价发行,发行后债券价值随到期时间的缩短而波动下降,至到期日债券价值等于债券面值
B. 债券折价发行,发行后债券价值随到期时间的缩短而波动上升,至到期日债券价值等于债券面值
C. 债券折价发行,发行后债券价值随到期时间的缩短而逐渐上升,至到期日债券价值等于债券面值
D. 债券按面值发行,发行后债券价值在两个付息日之间呈周期性波动
空间插值法是指()。
A. 根据矢量图形推断整个区域内事物的变化
B. 产生三维表面模型
C. 根据样本的位置和属性推断整个区域内事物在空间上的变化
D. 根据栅格图像推断整个区域内事物的变化
高能射线是能量在1Mev以上的X射线,采用直线加速器产生的高能X射线与一般X射线相比,具有()等特点。
A. 穿透能力强
B. 焦点小
C. 转换效率高
D. B和C
根据下列材料,回答下面的题目 For the 26 month.mysterious falls of large chunks of ice(冰雹) 27 rained down on Spain and Italy.Juana Sanchez。a 70一year—old woman in Almeria,southern Spain,was knocked 28 when she was struck on the shoulder by a falling ice chunk 29 she walked in a street 30 her home.On January l2,just about 200 miles away in Seville,a man narrowly 3l serious injury when a 9-pound ball of ice32into his car.33 me evening of January 27 priests at the salesian monastery in L,Aquila,Italy were startled by.a loud crash. 34 the noise,the dlscovered a large chunk of ice on their yard,35 intact. Upon examination。the block of ice 36 in at 2 kilograms and no source 37.On the same day,about l00 miles northeast in Ancona,Italy,the local officials were called to investigate the report of a maIl 38 was struck 39 the head by a l kilogram chunk of ice that apparently fell from the sky. spain and Italy area"the only European40 getting attacked by huge ice blocks in January On JaIluary 2 in Surrey,England(southwest of London),an East Indian man was walkingthrough Newton Amletic Park when he41a strange whistling sound overhead.‘Seconds 42 ,a large hunk of ice fell out of the clear blue sky and pounded in‘to the soft ground,shattering over a 50 foot—wide area.The ice dug a hole of a foot deep and a foot in di锄eter. Even the shattered remnins of the mystery ice were as large as tennis balls and were described as opaque 43 no unusual color or smell. Although eyewitnesses to the phenomenon report that they did not see anything in the sky that could account 44 the ice,scientists had to come up with a rationalization.Professor Jesus Mar tinez Frias,the geologist investigating the ice falls in Spain,told BBC News t}lat me ice Dieces had probably been 45through sudden temperature drops in the stratosphere.nlis was the most like1y explanation,he said,for the‘‘very unusual”phenomenon.
A. large
B. largely
C. big
D. huge