题干
In the USA, the students who study business is more than _______ those who study agriculture.
A：as many as ten time
B：as ten times tha
C：ten times as many a
D：than ten time
答案(点此获取答案解析）
C
的一元二次方程
有实数根.
的取值范围.
中，
的长是方程
的长.