型号2AP9是（）二极管。
A.锗普通
B.硅普通
C.锗开关
D.硅开关
参考答案：A
As a senior high student, you should your energy on how to master the skills of learning.
A．impress
B．spend
C．concentrate
D．use
邪正盛衰对疾病的发展及转归的影响是什么？
