单项选择题
A.Th=0.76T1.3B.Th=0.56T1.3C.Th=0.76T1.6D.Th=0.56T1.6
A.大气环流B.海陆分布C.地形和地貌D.冷暖洋流
A.3~7dB.15~20dC.10~20dD.5~10d
A.20~35dB.20~30dC.50~60dD.20~40d
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