4.5( )＞45( )＞450( ),120( )＜1.2( )＜1.2( )

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4.5()＞45()＞450(),120()＜1.2()＜1.2()4.5()＞45()＞450(),120()＜1.2()＜1.2()4.5()＞45()＞450(),120()＜1.2()＜1.2

4.5( )＞45( )＞450( ),120( )＜1.2( )＜1.2( )
4.5( )＞45( )＞450( ),120( )＜1.2( )＜1.2( )

4.5( )＞45( )＞450( ),120( )＜1.2( )＜1.2( )
4.5(小时)＞45(分)＞450(秒)
120(平方米)＜1.2(公顷)＜1.2(平方千米)