加热炉外壁面与环境间的传热属于下述哪种传热方式？（）
A.辐射传热
B.导热
C.对流传热
D.复合传热
参考答案：D
I don't have a brother ______________ a sister. [ ]
A. or
B. and
C. the
D. but
溶原性转变
