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An annularity(日环食) is expected to cross China Friday afternoon, a researcher with the Purple Mountain Observatory under the Chinese Academy of Sciences said Wednesday. The phenomenon, predicted to be the longest annularity of the next 1,000 years, can be seen in some areas of Yunnan, Sichuan, Guizhou, Shaanxi, Hunan,  Hubei,  Henan, Anhui, Jiangsu and Shandong provinces as well as Chongqing. A partial eclipse(日偏食) would be seen in most of the rest of China, except for the northeast tip of Heilongjiang Province, said Cheng. According to the National Aeronautics and Space Administration (NASA) of the United States, the annularity will begin in Africa and pass through the Indian Ocean, where the maximum duration(持续的时间) of annularity will reach 11 minutes and 8 seconds. It will continue into Asia through Bangladesh, India, Myanmar and China. Cheng said the annularity will end at Jiaodong peninsula in Shandong Province, China. The longest duration of the annularity on China’s territory would be 8 minutes and 17 seconds in Ruili, Yunan Province. A sunset with the annularity would be seen in some areas of Shandong, Guangdong and Taiwan, said Cheng. An annularity occurs when the moon does not cover the entire disc of the sun so that a ring of light encircles the shadow of the moon. Another expert said that though an annularity was not considered as wonderful as a total solar eclipse and was of little value in scientific research. It was interesting for the general public to watch the phenomenon, though. 60.The annularity mentioned in the passage is unusual because        . A. it is expected to cross all over China B. it begins in Africa and passes through Asia C. it is of great importance in scientific research D. it lasts the longest in the next one thousand years 61.From the passage we may conclude that people in Fujian can only enjoy the scene of      . A. an annularity            B. a partial solar eclipse C. a total solar eclipse           D. a sunset with the annularity 62.People       can enjoy the longest duration of the annularity on Friday. A. in Africa    B. in India      C. in China     D. on the Indian Ocean 63.Which of the following is TRUE according to the text? A. The annularity will end in Shandong Province. B. The annularity can be seen by people all over China. C. The phenomenon is an exciting one to the astronomers only. D. A partial eclipse occurs when a ring of light encircles the shadow of the moon.
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【单选题】( )是在美国使用的未经许可的频带。
A.
2.0MHz
B.
2.4GHz
C.
7.0GHz
D.
6.8GHz
【多选题】以下哪两项是在美国使用的未经许可的频带?(选择两项) A、2.0MHz B、2.4GHz C、5.0GHz D、6.8GHz
A.
B.
C.
D.
【单选题】太阳视运动是:
A.
太阳周日视运动和周年视运动的合运动
B.
太阳周日视运动
C.
太阳周年视运动
D.
太阳真运动
【判断题】任意两条无差异曲线不能相交,否则交点的效用无法判断。
A.
正确
B.
错误
【多选题】以下那两项是在美国使用的未经许可的频带?
A.
2.0MHz
B.
2.4GHz
C.
5.0GHz
D.
6.8GHz
【单选题】以下( )是在美国使用的未经许可的频带
A.
2.0MHz
B.
2.4GHz
C.
7.0GHz
D.
6.8GHz
【单选题】()是在美国使用的未经许可的频带。
A.
2.0MHZ
B.
2.4GHZ
C.
7.0GHZ
D.
6.8GHZ
【单选题】清朝政府宣布废除科举制度,兴办采用班级授课制的学校是在( )。
A.
1901年
B.
1903年
C.
1904年
D.
1905年
【多选题】以下哪两项是在美国使用的未经许可的频带()(选择两项)
A.
2.0MHz
B.
2.4GHz
C.
5.0GHz
D.
6.8GHz
【单选题】覆盖于电极表面的物种(电极一侧)经过氧化-还原形成另外一种附着于电极表面的物种,这是哪种类型电极反应的描述?
A.
简单电子迁移反应
B.
金属沉积反应
C.
表面膜转移反应
D.
腐蚀反应
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