The film Harry Potter was quite _____ hit across the world, bringing in ____ income of box office of over millions of dollars within five months.[ ]

A. /; an          

B. a; /          

C. a; an          

D. a; the

螺母紧固后，螺栓螺纹应露出螺母1～3个螺距，不得在螺母下面加多余的垫圈来减少数螺栓的伸出长度。（）