能测定苷键构型的方法是
A.碱水解
B.UV
C.H-NMR
D.IR
E.MS
参考答案:C
解析:苷键构型的确定方法有酶水解法、Klyne经验公式进行计算、利用NMR确定。
哪个表示春雷响过后,冬眠的昆虫被惊醒的意思()
A.惊蛰
B.白露
C.雨水
D.梅雨
—When will you be through with your work.Jones —______My boss usuallY finds something for me to do at the last minute.
A.Who knows B.Would you help meC.I beg your pardon D.Anything the matter