标准灰
参考答案：
18%反光率所产生的灰色影调，也称V区中灰，是曝光的基准。
In relation to the Securities Law of China:
(d) explain the situation in which the underwriting with best efforts shall be deemed as a failure, and explain the statutory obligations of the issuer. (4 marks)
宴会菜单制定的一般原则？
