At the meeting Mr. King didn't say a word from beginning to end, ______? [ ]

A. didn't Mr. King

B. did he

C. did Mr. King

D. didn't he

在传热实验中用饱和水蒸汽加热空气，总传热系数K接近于空气侧的对流传热系数，而壁温接近于饱和水蒸汽侧流体的温度值。