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【简答题】
假设海水中的电磁参量为ε r =81，μ r =1，σ=5.1S/m。试问：什么频率范围内海水可以看做良好导体；什么频率范围内可以看做低损耗介质?
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【简答题】医养结合联合运营模式
【单选题】I was to have a trip abroad if ________.
A.
I had not been fired
B.
I was not fired
C.
my boss won't have fired me
D.
I were not fired
【简答题】Frankie: Do I ___________ go to bed now?Paul: Yes, Frankie. It's 10:00. It's time for bed.2. Laura: Maggie, ___________ I help you?Maggie: Yes. I don't understand these math problems.3. Laura: Doctor ...
【单选题】听力原文：W: Tony, I just moved into my new apartment, and I need to have the phones hooked up. I have no idea what I am doing. I have to make all these decisions about local, local long-distance, and long...
A.
Lower prices.
B.
More choices.
C.
More competition.
D.
More companies.
【单选题】听力原文：W: Tony, I just moved into my new apartment, and I need to have the phones hooked up. I have no idea what I am doing. I have to make all these decisions about local, local long-distance, and long...
A.
Lower prices.
B.
More choices.
C.
More competition.
D.
More companies.
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