6[单选题] 对于单相交变频电路如下图，在t2～t3时间段内，P组晶闸管变流装置与N组晶闸管变流装置的工作状态是（） A.P组阻断，N组逆变 B.P组阻断，N组整流 C.N组阻断， - 查题网

>> 河南成教 / 电力电子技术

河南成教 / 电力电子技术

正确率：100%

6[单选题]
对于单相交变频电路如下图，在t2～t3时间段内，P组晶闸管变流装置与N组晶闸管变流装置的工作状态是（）

A.P组阻断，N组逆变

B.P组阻断，N组整流

C.N组阻断，P组整流

D.N组阻断，P组逆变

积分

电力电子技术

参考答案：

点击查看答案

佳题速递：

对语文教学目的表述最为全面、最准确的大纲是（）小学语文教学论

所谓视差，是当眼睛在目镜端上、下微动时，看到十字丝与目标的影像相互移动的现象。建筑测量

某购销合同纠纷的当事人，以火车票面上记载的地点和时间为依据，来证明购销合同签订的时间和地点，该火车票属于( )。民事诉讼法学

下列因素中不属于影响师生互动的因素是。 A、家长 B、教师 C、学生 D、环境班队管理与教育

4[阅读题] Upon reaching an appropriate age (usually between 18 and 21 years), children are encouraged, but not forced, to “leave the nest” and begin an independent life. After children leave home they often find social relationship and financial support outside the family. Parents do not arrange marriages for their children, nor do children usually ask permission of their parents to get married. Romantic love is most often the basis for marriage in the United States; young adults meet their future spouses (配偶) through other friends, at jobs, and in organizations and religious institutions. Although children choose their own spouses, they still hope their parents will approve of their choices. In many families, parents feel that children should make major life decisions by themselves. A parent may try to influence a child to follow a particular profession but the child is free to choose another career. Sometimes children do precisely the opposite of what their parents wish in order to assert their independence. A son may deliberately decide not to go into his father’s business because of a fear that he will lose his autonomy in his father’s workplace. This independence from parents is not an indication that parents and children do not love each other. Strong love between parents and children is universal and this is no exception in the American family. Coexisting with such love in the American family are cultural values of self-reliance and independence. 1. The writer discusses the marriage of young adults in order to show that they _____. A. enjoy the freedom of choosing their spouses B. want to win the permission of their parents C. have a strong desire to become independent D. try to challenge the authority of their parents 2. Most young adults in America would get married for the sake of ____. A. love B. financial concern C. their parents D. family background 3. Based on the passage, it can be inferred that _____. A. American young adults are likely to follow the suit of their parents. B. most American parents never make major decisions for their children. C. American young adults possess cultural values of independence. D. when a young adult steps into his twenties, he will leave his home permanently. 4. A son is unwilling to work in his father’s business mainly because he _____. A. wishes to make full use of what he has learnt in school B. wants to prove his independence C. likes to do the opposite of what his parents approve of D. tries to show his love for his parents 5. The subject matter of this passage is _____. A. cultural values in the American family B. marriage arrangements C. young adult’s pursuit of a career D. decision making 英语

企业提供现金折扣的好处在于( )财务管理