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【单选题】
和相位差的有效范围均为：A.
【-π，π】
B.
【-π/2，π/2】
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【单选题】"Exurbs" most probably refers to ____.
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regions situated farther away from city than suburbs
B.
rural areas where residents have to commute wot work
C.
suburbs with high-end facilities
D.
intelligent residential districts
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B.
April 29
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