单稳态触发器电路在没有输入信号作用时，电路处于（）
A.稳态
B.暂稳态
C.放大状态
D.电源电压
参考答案：A
— O’Neal works hard.
— So he does. He is often seen _____ heavily before his teammates have even arrived at practice.
A．to be sweated
B．sweated
C．be sweated
D．sweating
下列混合物中，不能用分液漏斗分离的是
A．乙醇和水
B．硝基苯和水
C．溴苯和水
D．四氯化碳和水
