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【简答题】
已知E=10e x e -iπ/4 e -i2πy +e z E 0 e iφ e -i2πy ，当 (1)E 0 =0 (2)E 0 =20，φ=5π/4 (3)E 0 =10，φ=π/4 (4)E 0 =10，φ=3π/4 (5) E 0 =10，φ=π/2 分别是什么极化波?
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举一反三
【简答题】Computers _______ (use) widely in our daily life.
【单选题】Although the teacher had told Bob the history of telephone, Bob didn’t know when ____.
A.
it was invent
B.
was it invented
C.
it was invented
D.
it invented