GIF89a+,+ڋ:x58ir!&%J/{NYyhxD!a,tz16]nbXLD,z4,҃Ra 9VbFXwUXFfhx8ǙٹhWi7E )J!7tvY;Ӹ%+ hʺJ:Hi#"8"L\]Gۭ87A-Cn]o_RT.m߿L|QÈ+Z1ƍ;z2ȑ$K<2ʕ,[|!oĩp#O{<")L(48`Il/]|xR~ܹ! MathType001 M s (dB)=20log(M s ),S s (dB)=20log(S s );