凝胶层析中,有时小分子溶质的Kd<1,其原因是()。
A.水合作用
B.凝胶吸附
C.柱床过长
D.流速过低
参考答案:A
Tom wrote __good composition that he was praised by all the teachers in the school.
A.so a
B.such a
C.a so
D.a such
康德哲学中贯穿始终的基本范畴是()
A、自在之物
B、感性
C、理性
D、现象
E、知性