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【单选题】
关于光电效应说法错误的是A.
光电器件的理论基础是光电效应。
B.
光可以认为是由一定能量的粒子 ( 光子 ) 所形成，每个光子具有的能量 h γ 正比于光的频率 γ ，即光的频率越高，其光子的能量就越大。
C.
用光照射某一物体，可以看做物体受到一连串能量为 h γ 的光子所轰击，组成该物体的材料吸收光子能量而发生相应电效应的物理现象称为光电效应。
D.
光照射于某一物体上，使电子从这些物体表面逸出的现象称为内光电效应
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【单选题】听力原文： If a city ever needed tall buildings in a hurry, it was Chicago in the 1880s. Located in the center of America's farmland, with rail links to every coast, it was the natural hub of commerce for ...
A.
They used bricks and they are too heavy.
B.
They used bricks that were too expensive.
C.
Steel was in short supply.
D.
The benefits of steel were unknown to them.
【单选题】How was the weather in your country?
A.
What was the weather
B.
What was it
C.
What was the weather like
【单选题】若有定义int a[10],*p;则不能使p指向数组元素a[5]的赋值语句是_____。
A.
p = a+5;
B.
p = &a[5];
C.
p = *(a+5)
D.
p = a; p+=5;
【单选题】A: ________ B: It was snowy. [ ]
A.
What was the weather like yesterday?
B.
How was the weather yesterday? C How was the food? D. A and B
【单选题】下列哪一反应的 代表KBr(s)的晶格能U( )
A.
K + (g)+Br - (g)→KBr(s)
B.
K(s)+1/2Br 2 (l)→KBr(s)
C.
K + (g)+Br - (g)→KBr(g)
D.
KBr(s)→K + (g)+Br - (g)
【简答题】How was the weather in the country?
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