开关磁阻电动机的显著特征为,转子上既无绕组也不需要电磁铁,位移的磁势来自绕组。
查看答案
一般低于三相的开关磁阻电动机都不具备自启动能力。
A. 对
B. 错
单相开关磁阻电动机也可自行启动。
A. 对
B. 错
Directions: In this section, there is a passage with ten blanks. You are requiredto select one word for each blank from a list of choices given in a word bankfollowing the passage. Read the passage through carefully before making yourchoices. Each choice in the bank is identified by a letter. Fill in each blank with aletter. You may not use any of the words in the bank more than once.Born in Yorkshire, England, Sir Cyril Taylor is the founder and Chairman of AIFS.His long and distinguished career in public 1_____ and education includes many accomplishments. After graduating from Harvard, Sir Cyril accepted a position in brandmanagement with Procter & Gamble at the company's headquarters in Cincinnati, Ohio.During his time with P&G, he developed an idea for a(n) 2_____new business. In 1964,he left the3_____ and security of his corporate job at P&G to 4_____ the AmericanInstitute for Foreign Study. More than 40 years later, AIFS has global offices in fivecountries and annual revenues in 5_____ of $180 million. Today, Sir Cyril continuesto serve as Chairman of AIFS. Since 1987, Sir Cyril has served as Chairman of theSpecialist Schools and Academies Trust (SSAT). He has also acted in a(n) 6_____ andunpaid capacity as Advisor on specialist schools to ten 7_____ Secretaries of State forEducation. Over the years, Sir Cyril has8_____ active in public service and received anumber of9_____ for his work. From 1977 to 1986, he served on the Greater London Council and during this time was elected deputy leader. In 1989, he was awardeda knighthood in10_____ of his service in education and in 2003 he was given theappointment of a Knight Grand Cross of the Order of the British Empire (GBE).请将以下单词所对应的字母填入横线上(注意:只填字母)A) excessB) foundC) scholarshipD) innovativeE) recognitionF) successiveG) voluntaryH) publishI) keptJ) serviceK) honorsL) remainedM) comfortN) securitiesO) continuous
大班儿童结构游戏,教师多采用( )的方法进行指导。
A. 情境模拟法
B. 示范讲解结合法
C. 语言提示法
D. 动作示范法