题目内容

By using “micro-irrigation”, in which water is piped and fed onto crops through sealed systems, irrigation can be made 90% efficient.

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Nevertheless, it is the political level that determines whether the battle to fight against the global water problems will ultimately be won or lost.

v.拒绝，不同意n.废弃物，垃圾

膀胱内充满尿液但不能自行排出,称为

A. 尿失禁
B. 尿潴留
C. 尿频
D. 遗尿

醛固酮的作用是

A. 保Na+排K+
B. 保K+排Na+
C. 保Na+保K+
D. 排Na+排K+