Choice questions选择题 Comprehension理解 1.The writer probably _____ (a)didn't like the hat his wife had chosen (b)liked the hat his wife had chosen (c)chose a hat for his wife (d)chose the hat that looked like a lighthouse
A.
didn't like the hat his wife had chosen
B.
liked the hat his wife had chosen
C.
chose a hat for his wife
D.
chose the hat that looked like a lighthouse
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皮皮学刷刷变学霸
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【简答题】已知真空中的均匀平面波电场强度瞬时值为 (1)频率f、波长λ、相速ν p 及相位常数β; (2)电场强度复数表达式,磁场强度复数及瞬时值表达式; (3)能流密度矢量瞬时值及平均值。