问题
单项选择题
经过一个分光比为1：8的分光器后造成光的衰耗约为（）Db
A.3；
B.6；
C.9；
D.12
答案
参考答案：C
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经过一个分光比为1：8的分光器后造成光的衰耗约为（）Db
A.3；
B.6；
C.9；
D.12
参考答案：C
| 阅读理解。 | ||||||||
for a better living in the future.
(副口号)-"My Will, My Help, My Pleasure" "2010, We're Together As One" and "Our City, Your Joy." | ||||||||
| 1. The opening of the 2010 World Expo was celebrated in _____ on the _____ of April 30. | ||||||||
| A. Beijing; morning B. Shanghai; morning C. Beijing; evening D. Shanghai; evening | ||||||||
| 2. The theme of Expo 2010 is "_____". | ||||||||
| A. Better City, Better Life B. Our City, Your Joy C. My Will, My Help, My Pleasure D. 2010, We're Together As One | ||||||||
| 3. The Expo emblem is in the shape of the Chinese Character "_____". | ||||||||
| A. 世 B. 人 C. 心 D. 鸽 | ||||||||
| 4. The volunteer slogan for the Expo is "At Your Service At Expo" with _____ sub-slogans. | ||||||||
| A. two B. three C. four D. five |
