【单选题】
<img title=无标题415.jpg alt=无标题415.jpg src=https://huaweicloudobs.ahjxjy.cn/39CF5309B7608E88995764FE288CD8B0.jpg/>
①
<img class=jc-formula style=vertical-align: middle; src=https://huaweicloudobs.ahjxjy.cn/E748D6574C408C93B7B80461A8099E47.png data-tex=A=3A,{ R }_{ 1 }=\frac { 50 }{ 3 } \Omega ,{ R }_{ L }=6\Omega ,{ { X }_{ L } }=8\Omega />
②
A=3A<img class=jc-formula style=vertical-align: middle; src=https://huaweicloudobs.ahjxjy.cn/AE8788B340FB8FA4A16969F73DD8AD81.png data-tex=A=3A,{ R }_{ 1 }=\frac { 50 }{ 3 } \Omega ,{ R }_{ L }=8\Omega ,{ X }_{ L }=6\Omega />
③
<img class=jc-formula style=vertical-align: middle; src=https://huaweicloudobs.ahjxjy.cn/2CA74832418B0B563849DB17F5411CC5.png data-tex=A=3A,{ R }_{ 1 }=6\Omega ,{ R }_{ L }=\frac { 50 }{ 3 } \Omega ,{ X }_{ L }=6\Omega />
④
<img class=jc-formula style=vertical-align: middle; src=https://huaweicloudobs.ahjxjy.cn/4905E43D8F71453F445B49487198301F.png data-tex=A=5A,{ R }_{ 1 }=\frac { 50 }{ 3 } \Omega ,{ R }_{ L }=6\Omega ,{ X }_{ L }=8\Omega />