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问题
填空题
中性和石灰性土壤有效磷含量的测定采用（）浸提。
答案
参考答案：碳酸氢钠
选择题
Leonardo da Vinci (1452 - 1519) _____ birds kept in cages in order to have the pleasure of setting them free.
A. is said to be buying
B. is said to have bought
C. had said to buy
D. has said to have bought
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多项选择题
城市规划的类型包括( )。
A．详细规划
B．近期规划
C．长期规划
D．分区规划
E．总体规划
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