【判断题】【消耗次数:1】
直流电路中,有电流通过之处就一定有电压。
正确
错误
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相关题目
【判断题】 直流电路中,没有电压之处就一定没有电流。
①  正确
②  错误
【判断题】 直流电源中的整流电路的作用是将直流电压转换为交流电压。
①  正确
②  错误
【判断题】 电磁系仪表是测量直流电压与直流电流的一种常用仪表。
①  正确
②  错误
【判断题】 磁电系仪表广泛地用于直流电流和直流电压的测量。
①  正确
②  错误
【单选题】 直流电路中,()。
①  感抗为0,容抗为无穷大
②  感抗为无穷大,容抗为0
③  感抗和容抗均为0
④  感抗和容抗均为无穷大
【判断题】 直流电源是将电网电压的交流电转换成直流电的能量转换电路。
①  正确
②  错误
【判断题】 直流电流表可以用于交流电路测量。
①  正确
②  错误
【判断题】 将交流电变换成脉动直流电的电路称为整流电路,全波整流电路输出的直流电压平均值等于输入的交流电压(即变压器副边电压)有效值的0.9倍。
①  正确
②  错误
【判断题】 直流电源中的滤波电路的作用是减小电压的脉动。
①  正确
②  错误
【判断题】 在互感电路中,直流电流虽产生自感和互感磁通链,但不产生自感和互感电压。
①  正确
②  错误
随机题目
【单选题】 Which of the following is the time when students work in a pair?
①  When all the students are under the control of the teacher
②  When students work in pairs on an exercise or a task
③  When students work in small groups
④  When students are expected to work on their own at their own speed.
【单选题】 What role does a teacher play in the following activity? The teacher writes one of five numbers (1-5) on a number of cards (the same number as the students). Each student draws one card. Those who have drawn number 1 will form group1, and those who have drawn number 2 will form group 2. Thus the students are put into five groups in a random way.
①  Controller
②  Assessor
③  Organizer
④  Prompter.
【单选题】 What are language contents?
①  Structures, vocabulary, functions and topics
②  Pictures, vocabulary, communication and topics
③  PPT, structures, aims and summary
④  Structures, aims, functions and topics.
【单选题】 Which part is to be finished after a lesson in a lesson plan?
①  Teaching aids
②  End of a lesson summary
③  Optional activities and assignment
④  After lesson reflection.
【单选题】 What are the principles for good lesson planning?
①  Aim, variety, flexibility, learnability and linkage
②  Aim, preparation flexibility and linkage
③  Aim, micro-planning, macro-planning and flexibility
④  Aim, micro-planning, macro-planning and variety.
【单选题】 What is the function of optional activities?
①  Backups in case the lesson goes too fast and there are a few minutes left
②  Prepared for good students
③  Prepared for bad students
④  Used for emergency.
【单选题】 What are very commonly used teaching procedures and stages?
①  Presentation, practice and production
②  Pre-reading, while-reading and post-reading
③  Mechanical practice and meaningful practice
④  Both A and B.
【单选题】 What are the guidelines for writing teaching aims in a lesson plan?
①  Clear, brief
②  Specific, students-oriented
③  Specific, teacher-oriented
④  Both A and B.
【单选题】 What is discourse competence concerned with?
①  Appropriate use of the language in social context
②  Ability to create coherent written text or conversation and the ability to understand them
③  Strategies one employs when there is communication breakdown due to lack of resources
④  Knowledge of language itself, its form and meaning.
【单选题】 What is strategic competence concerned with?
①  Appropriate use of the language in social context
②  Ability to create coherent written text or conversation and the ability to understand them
③  Strategies one employs when there is communication breakdown due to lack of resources
④  Knowledge of language itself, its form and meaning.