判断题
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Intermediate oxidation is usually located after precipi...
单项选择题Intermediate oxidation is usually located after precipitation or filtration, and ozone, ultraviolet, chlorine dioxide can be used. A、正确 B、错误
Guitar is a kind of musical instrument of country music...
单项选择题Guitar is a kind of musical instrument of country music.( ) A. 对 B. 错
3、生态因子具有非等价性,其中必有1-2个是起关键作用的主导因子,因此,缺失的因子可以用另一个因子代替。( )...
单项选择题3、生态因子具有非等价性,其中必有1-2个是起关键作用的主导因子,因此,缺失的因子可以用另一个因子代替。( )