油菜菌核病侵染的主要时期在油菜（）
A、苗期
B、开花期
C、结荚期
参考答案：C
— How did your interview with the manager go?
— _________ He seemed interested in my experience, but he didn’t ask for reference.
A．Perfect!
B．I’m not sure.
C．That’s right.
D．Couldn’t be better.
生物碱的沉淀试剂有（）
A.碘化铋钾
B.碘化汞钾
C.硅钨酸
D.浓硫酸
E.浓盐酸
