总氮测定方法通常采用过硫酸钾氧化,使水中()和()转变为硝酸盐。然后再以紫外分光光度法、偶氮化色法、离子色谱法或气相分子吸收法进行测定。
参考答案:有机氮;无机氮(化合物)
简述营造班集体良好心理氛围的途径与举措。
Clearly and thoughtfully________, the book inspires confidence in students who wish to seek their own answers.
A.writing
B.to write
C.written
D.being written