下列病证出现往来寒热，发有定时的是（）。
A.疟疾
B.少阳病
C.阳明病
D.伤寒
E.湿温
参考答案：A
-----Let’s go to a place _______ we can make a round—trip in one day?
------What about one _______ we can climb and swim?
A．to which; where
B．where; where
C．where; in which
D．in which; where http:/
利用晶体二级管作为整流元件时，其反向电阻与正向电阻的比值为（）时最好。
A.1
B.越大
C.越小
D.0
