用琼脂糖凝胶电泳法测定血清乳酸脱氢酶同工酶,其区带为()
A.1条
B.2条
C.3条
D.4条
E.5条
参考答案:E
— Look! The window is broken. Someone broke it _____ purpose.
— That may be right. But perhaps it was broken _____ accident. [ ]
A. on; by
B. by; by
C. on; on
D. by; on
某课题组以苯为主要原料,采取以下路线合成利胆药——柳胺酚。回答下列问题: