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【单选题】
关于光电效应的说法中,正确的有 ( )A.
要使光电效应发生,入射光子的能量必须大于原子的电离能
B.
极限频率的存在,可以表明电子对光子的吸收是一对一的
C.
增大入射光子的能量,光电子的最大初动能不变
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皮皮学刷刷变学霸
举一反三
【简答题】单片机的复位就相当于计算机的( )
【单选题】关于网络外部性的描述应当被解释为:
A.
对某一商品的需求是随着价格的降低而增加的
B.
一个商品的价值随其预期将售数量的增加而增加
C.
边际效用递减
D.
价低买者众、价高买者寡
【单选题】关于网络外部性的描述应当被解释为
A.
对某一商品的需求是随着价格的降低而增加
B.
一个商品的价值随其预期将售数量的增加而增加
C.
边际效用递减
D.
价低买者众、价高买者寡
【单选题】We shall fight on the seas and oceans, we shall fight on the beaches, we shall fight on the landing grounds, we shall fight in the fields and in the streets, we shall fight in the hills.
A.
anaphora
B.
repetition
C.
metonymy
D.
overstatement
【简答题】If you like writing and taking photos, you should consider an intership with ______.
【单选题】In China we walk of the street (街道). [ ]
A.
on the left
B.
on the right
C.
in the middle
D.
left and right
【单选题】A: We took the first on the left.
A.
B: You SHOULD have taken the first on the right.
B.
B: You should have TAken the first on the right.
C.
B: You should have taken the FIRST on the right.
D.
B: You should have taken the first on the RIGHT.
【单选题】WANTED Do you like to talk with people? Do you like to edit some articles? If you want to work for our newspaper as a part-time editor, please call Karen at 5583666. 20. If you are a college student o...
A.
waiter
B.
baby-sister
C.
cleaner
D.
editor
【简答题】200号溶剂汽油是烃类化合物的混合物，由于其中芳烃含量不同，它表现的（）力也不同。
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