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【单选题】
在如图所示的单缝夫琅衍射装置中，设中央的衍射角范围很小．若使单缝宽度变为原来的【图片】，同时使入射的单色光的波长l变为原来的3 / 4，则屏幕C上单缝衍射条纹中央的宽度Dx将变为原来的【图片】A.
3 / 4 倍．
B.
2 / 3 倍．
C.
9 / 8 倍．
D.
1 / 2 倍．
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【简答题】计算机网络按照其传播方式的不同，我们可以将之分为 和”点-点网络“A. 广播网络
【简答题】数码管的显示方式有静态和 两种。
【单选题】The one thing we need to be alert about the Internet is ____________.
A.
to live our real life with a virtual identity
B.
not to let the virtual life online dominate our real life
C.
to accept whatever information coming to us
D.
to stop using it since it is doing harm to us
【单选题】Analysts commonly describe two distinct modes of communication in the Internet of Things: One is thing-to-person communication, and the other is_______.
A.
person-to-person communication
B.
person-to-thing communication
C.
thing-to-thing communication
D.
client-and-service communication
【单选题】The thing the author like best about the Internet is that ______.
A.
he is able to explain his ideas in a simple language
B.
his writing is not changed by his boss
C.
he is able to communicate with people all over the world
D.
a lot of people have left entries and thanked him for his efforts
【简答题】LED 数码管有 显示和 显示两种方式。
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