已知某些系统的开环传递函数如下,属于最小相位系统的是()
①
<imgwidth="62"height="44"src="../uploadfiles/word/zdkzll002.files/image027.png">
②
<imgwidth="70"height="44"src="../uploadfiles/word/zdkzll002.files/image028.png">
③
<imgwidth="80"height="44"src="../uploadfiles/word/zdkzll002.files/image029.png">
④
<imgwidth="58"height="44"src="../uploadfiles/word/zdkzll002.files/image030.png">