高粱经过培育和选择形成许多变种和品种。按其用途和花序、籽粒的形态不同分为哪4类?
参考答案:粒用高粱、糖用高粱、饲用高粱和帚用高粱。
Questions 24-30
Many Americans are getting fatter ______.
A.because of their poor eating habits and sedentary lifestyle
B.because of their ignorance about what is good for them
C.because of their p dislike for physical exercises
下列哪个不是渠道设计决策典范基础阶段的一部分?()
A.预测影响渠道结构的变量
B.选择最佳渠道结构
C.对渠道设计决策的认知
D.发展劳动力专业化和分工化
E.设计和协调分销目标