问答题

农作物灌溉制度的主要内容有（）

A.灌水定额
B.灌水时间
C.灌水次数
D.灌溉定额
E.灌溉水利用率

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有坝引水枢纽主要由（）等建筑物组成。

A.拦河坝（闸）
B.进水闸
C.导流堤
D.冲沙闸
E.防洪堤

A．They are healthy, normal-weight men and women in their 40s.
B．They ate only one meal every day during the study.
C．They lost an average of 8 percent of their weight by the end of the study.
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A.They
B.
B．They
C.
C．They
D.
D．They