按照国际的通行看法，月收入的（）是房贷按揭的一条警戒线。 [" 1\/2"," 1\/3"," 1\/6"," 1\/4"]
燃气计量表高位安装时，表底距地面不宜小于（）。 ["0.1米","0.4米","1.0米","1.4米"]
（）长期在享誉世界的公共政策思想库——兰德公司从事政策分析的理论与实践研究。
Which three statements are true？（） [" The default constructor initializes method variables."," The default constructor has the same access as its class."," The default constructor invoked the no-arg constructor of the superclass."," If a class lacks a no-arg constructor， the compiler always creates a default constructor. "," The compiler creates a default constructor only when there are no other constructors for the class."]
土壤学
固定化酶
