Free morphemes were traditionally called root.()
Motivation is not an important factor in second language acquisition except.()
正确的说法是
A. 1摩尔H2占有体积约为22.4升
B. 氧气在标准状况下,占有体积约为22.4升
C. 1摩尔氧气在标准状况下,占有体积约为22.4升
D. 标准状况下,1摩尔水占有体积约为22.4升
E. 32克氧气在标准状况下,占有体积约为44.8升
蛋白质紫外吸收的描述不正确的是
A. 吸收波长为280nm
B. 因为含有酪氨酸
C. 因为含有色氨酸
D. 可用于蛋白质含量测定
E. 吸收波长为256nm