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【单选题】
状线的特性阻抗如下表，如果传输线的特性阻抗为50Ω，能购置到的介质板厚度b为0.5mm，相对介电常数为4。介质板上的铜皮厚度t为0.05mm，带状线应取的宽度大约为：【图片】A.
0.1655mm
B.
0.584mm
C.
0.240mm
D.
0.105mm
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【单选题】What is the relationship between the speakers?
A.
Teacher pupil.
B.
Parent child.
C.
Shop assistant and customer.
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【简答题】A(n) _________ (assist) in the shop took the book and checked the price on the back cover.
【单选题】---What does your mother do? ---She is ____________. She works in a hospital
A.
an actor
B.
a shop assistant
C.
a doctor
D.
a policeman
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