低于0oC—8oC为()的保存温度
A. 黑白相纸
B. 彩色相纸、光面相纸
C. 彩色相纸
D. 一般彩色感光材料
In 1995,an average of _______ of domestic travelers went on sightseeing in China.
A. 52.4%
B. 54.2%
C. 56.4%
D. 54.6%
____ you were busy, I wouldn’t have bothered you with questions.
A. If I realized
B. Had I realized
C. I realized
D. As I realized
_____ your timely advice,I would never have known how to go about the work.
A. Unless
But for
C. Except for
D. Not for