单选题多层平壁的稳定传热 t1＞t2，下列哪一条温度分布显示是正确的？<br/> A.<img border="0" alt="" src="https://tuku.weimei168.com/uploads/upimg/20251122/21142986_0.png"><br/> B.<img border="0" alt="" src="https://tuku.weimei168.com/uploads/upimg/20251122/21142986_0_1.png"><br/> C.<img border="0" alt="" src="https://tuku.weimei168.com/uploads/upimg/20251122/21142986_0_2.png"><br/> D.<img border="0" alt="" src="https://tuku.weimei168.com/uploads/upimg/20251122/21142986_0_3.png">