电路的三种状态是（）、开路状态和短路状态。
参考答案：额定状态
布病的传染源
A．羊B．狗C．鼠D．猪、鼠和狗E．猫
It’s such a good place ______ everyone wants to go and visit _______ it is well-known all over the world.
A．that; that
B．as; as
C．as; that
D．that; as
