居室内的自然照度至少需要（）。才能基本满足视觉功能的生理需要。
A.151x
B.251x
C.301x
D.751x
E.1001x
参考答案：D
— I would like to go to Hangzhou for my summer vacation .
—______
A. Well done. B. Have a good trip. C. Take it easy.
下列缩写表示为：英国药典
A．USP B．BP C．Ch.P D．NF E．JP
