【单选题】Current flowing in only one direction is called _____.
B.
omnidirectional current
【单选题】The current flowing first in one direction and then in another is called_____ current.
【简答题】简述二极管单向导电性并画出电路图(写在作业本上交)
【单选题】在唯物辩证法看来,水果同苹果的关系属于 ( ) 。
【单选题】使用含氯消毒液对手部进行消毒 , 应江双手在消毒液中浸泡至少 ( ) 。
【单选题】在唯物辩证法看来,水果同苹果、梨、香蕉、桃子等的关系属于( )