I didn't know ____ I was supposed to do.[ ]
A. when
B. what
C. how
D. where
答案:B
It was with great joy _____ he received the news ____ his lost son would soon return home.
A.because…that
B.that…that
C.because…which
D.that…×
流体在圆形直管内作强制湍流时,其对流传热系数与雷诺数Re的n次方成正比,其中n的值为()
A.0.5
B.0.8
C.1
D.2