下列微分方程中,( )是线性微分方程.
A、<span lang="EN-US" style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-size: 9pt; font-family: 宋体;"><span style="position: relative; top: 5pt;"><img width="71" height="18" src="blob:http://degree.qingshuxuetang.com/c6343ce5-d1e3-4004-b73f-b2f161753865" v:shapes="_x0000_i1025"></span></span><span style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-family: -webkit-standard; font-size: medium;"></span><br>
B、<span lang="EN-US" style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-size: 9pt; font-family: 宋体;"><span style="position: relative; top: 5pt;"><img width="71" height="18" src="blob:http://degree.qingshuxuetang.com/b990b712-421a-4e9f-a689-a219c300e5d4" v:shapes="_x0000_i1025"></span></span><span style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-family: -webkit-standard; font-size: medium;"></span><br>
C、<span lang="EN-US" style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-size: 9pt; font-family: 宋体;"><span style="position: relative; top: 5pt;"><img width="109" height="18" src="blob:http://degree.qingshuxuetang.com/1ad75d86-f5b8-4c36-ad1c-5a1fe0a1d5a8" v:shapes="_x0000_i1025"></span></span><span style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-family: -webkit-standard; font-size: medium;"></span><br>
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