用吸附色谱法分离生物碱常用的吸附剂是（）
A.聚酰胺
B.氧化铝
C.纤维素
D.活性炭
E.硅藻土
参考答案：B
Much to the disappointment of the neighboring countries, the Japanese government refuses to admit ____ crime they committed in ______ World War II in the history.
A．the; the
B．/;the
C．/;/
D．the;/
放射性同位素钬的原子核内的中子数与核外电子数之差是
A．32
B．67
C．99
D．166
的原子核内的中子数与核外电子数之差是