单项选择题 学生姓名字段与学生学号字段的关系一般是_______________. A. 一对一 B. 一对多 C. 多对多 D. 网状

问答题 饲料中的抗营养因子会( )饲料中养分的消化率。（不影响、提高、降低）

单项选择题 Which statements about the common heritage of mankind are NOT correct? A、It consists of areas that is not capable of being controlled by any single states. B、Such areas include the high seas, outer space and the Polar regions. C、Such areas do not belong to any single state, and it can be used by all D、The exploitation and exploration of such areas should be for the benefit of mankind.