题目内容:
What is the most widely used growth regulator in cotton production?
A.Gibberellin
B.Mepiquat chloride
C.Polyamine
D.Chlormequat
参考答案:
What is the most widely used growth regulator in cotton production?
A.Gibberellin
B.Mepiquat chloride
C.Polyamine
D.Chlormequat