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{α|0≤α≤π或6≤α≤2π}
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{x|a≤x≤b} {x|2a≤x≤a+b} {x|0≤x≤b﹣a} {x|0≤x≤a+b}
0.1≤P≤0.5 0.05≤P≤0.1 P≤0.5 P≤0.1 P≤0.05
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2≤k≤ 6≤k≤10 2≤k≤6 2≤k≤
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昼间≤70dB,夜间≤50dB 昼间≤70dB,夜间≤55dB 昼间≤60dB,夜间≤50dB 昼间≤65dB,夜间≤55dB
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