【判断题】施密特触发器具有两个稳态,属于双稳态电路,常用于波形变换、脉冲整形等。
【单选题】The boy by the police in the forest.
【单选题】—Is the boy by the window your brother? —It ______ him. [ ]
【判断题】施密特触发器具有两个稳态,属于双稳态电路,常用于波形变换、脉冲整形等。A. 对 B. 错
【简答题】用所给动词的适当形式填空。 1. They are trying______(save) the boy by doing everything. 2.—Why not______ (have)a rest? —Good idea. 3. You'd better______ (not play) football in the street. 4. When they______ (find) ...
【单选题】交流接触器与按钮关联的自锁环节是( ) 。