微生物生长繁殖所需六大营养要素是()、()、()、()、()和()。
参考答案:碳源、氮源、无机盐、生长因子、水、能源
Does her friend math?
A.does well in
B.do good at
C.do well in
D.do well at
氦氖激光片的吸收光谱峰值为()
A.533nm
B.633run
C.733nm
D.833nm
E.933nm