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【单选题】
With thousands of years of history and mythology【C1】______ , Athens—named【C2】______ the olive-tree-loving Athena (goddess of wisdom)-is【C3】______ a concrete jungle. It's an【C4】______ city enlivened by outdoor cafes, pedestrian streets, parks, gardens and characters aplenty. If you 【C5】______ the spirit of things, you might not even notice the layer of smog【C6】______ overhead. The city is【C7】______ on three sides by Mt Parnitha, Mt Pendeli and Mt Hymettos. Within Athens there are【C8】______ eight hills,【C9】______ the Acropolis and Lykavittos are the most prominent. The hills provide a peaceful respite from the clamor of the city, and offer stunning views【C10】______ the glistening waters of the Saronic Gulf—the city's boundary on the south side. Just about everything of interest to the traveler is within a small area【C11】______ Plateia Syntagmatos (Syntagma Square). This area is【C12】______ by the districts of Plaka to the south, Monassstiraki to the west, Kolonaki to the east and Omonia to the north. Plateia Syntagmatos is dominated by the old Royal Palace and is the beating【C13】______ of the business district, with luxury hotels, banks and airline offices. Plaka, nestled below the Acropolis, is the old Turkish quarter and【C14】______ all that existed【C15】______ Athens was declared the capital of independent Greece.【C16】______ Plaka is packed with tourists in【C17】______ season, it's also one of the prettiest and most atmospheric areas of the city. Monassstiraki is【C18】______ market district and a fascinating part of town【C19】______ . Psiri, nearby, is【C20】______ stylish cafes and bars and makes a great place to stop for a spot of lunch. Kolonaki, a classy residential area tucked in under Lykavittos Hill, is full of trendy boutiques, art galleries and cafes. 【C1】
A.
below the belt
B.
under its belt
C.
in its belt
D.
on its belt
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【判断题】一个原子中的电子吸收了具有特定能量的光子后可以从高能级跃迁到低能级。
A.
正确
B.
错误
【单选题】处理新生儿生理性黄疸最常用的方法是:
A.
使用白蛋白
B.
使用血浆
C.
光照治疗
D.
使用能量合剂
E.
可提早喂奶
【判断题】光子从高能级跃迁到低能级吸收能量。(  )
A.
正确
B.
错误
【简答题】宝石受到()激发,发出可见光的性质叫().宝石吸收一部分能量后,原子中低能级的电子跃迁到高能级,在吸收光谱中()带,但当电子从高能级()时,()出来,称之为发光.
【单选题】爱因斯坦指出光与物质有三种相互作用,( )是指在外来光子激励下,电子吸收外来光子能量,从低能级跃迁到高能级,变成自由电子。
A.
受激辐射
B.
受激吸收
C.
自发辐射
D.
自发吸收
【多选题】下列关于原子中电子的能级和跃迁,正确的是
A.
原子内层的电子能量较低
B.
电子从高能级跃迁到低能级时会发射光子
C.
电子从高能级跃迁到低能级时会吸收光子
D.
发光的颜色取决于电子跃迁的两个能级间的能量差
【单选题】处于激发态的原子,受适当能量的外来光子诱发,会从高能级跃迁到低能级,同时发射光子,这称为
A.
受激辐射
B.
受激吸收
C.
自发辐射
D.
激光辐射
【多选题】下列关于原子中电子的能级和跃迁,正确的有
A.
原子内层的电子能量较低
B.
电子从高能级跃迁到低能级时会发射光子
C.
电子从高能级跃迁到低能级时会吸收光子
D.
发光的颜色取决于电子跃迁的两个能级间的能量差
【单选题】处于高能级E2的电子,在未受外界激发的情况下,自发地跃迁到低能级E1,从而发射出一个能量为hf(=E2-E1)的光子的过程称为()
A.
自发辐射
B.
受激吸收
C.
受激辐射
D.
非辐射复合
【单选题】处于激发态的原子,受适当能量的外来光子诱发,会从高能级跃迁到低能级,同时发射光子,这称为
A.
受激吸收
B.
自发辐射
C.
受激辐射
D.
激光辐射
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