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【单选题】
关于光纤的无量纲参数 u , w 和 V,说法错误的是A.
u是径向归一化相位常数，w是径向归一化衰减常数
B.
u、w分别表示光纤的纤芯和包层中，沿轴向的变化情况
C.
D.
V叫做光纤的化频率，它概括了光纤的结构参数（a、n1、n2）和工作波长
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【简答题】What is the main characteristic of the musical plane?A. It can only be experienced by people who have studied to read music. B. It is the ability to experience
different musical elements. C. It is the...
【单选题】What makes the difference in making the brighter musical tone?
A.
The density of the wood of which the guitar is made.
B.
The weight of the wood which the guitar is made.
C.
The shape in which the guitar is made.
D.
The way the guitar is played.
【单选题】What is important for reaching daily musical goals?
A.
Tell the children to practice 12 minutes.
B.
Tell the children to practice 40 minutes.
C.
The children know the musical goal of each daily practice time.
【单选题】What is important for reaching daily musical goals?
A.
Tell the children to practice 12 munutes.
B.
Tell the children to practice 40 munutes.
C.
The children know the musical goal of each daily practice time.
【单选题】According to the speaker, what is NOT a feature at this place?
A.
A flower clock.
B.
A musical fountain.
C.
A live band.
D.
A boat ride.
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