单项选择题

Organic nitrogen is converted back to inorganic nitrogen like ammonium through the process of ()
A、Denitrification
B、Nitrogen fixation
C、Decay
D、Nitrification

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Accounting provides financial information that is only useful to business management.（）

答案：正确答案：错误

单项选择题

Which one of heart sounds should be heard in healthy adult? ( )

A．S1+S2
B．S1+S2+S3
C．S1+S2+S4
D．S1+S2+S3+S4
E．S3+S4