【单选题】【消耗次数：1】
交流发电机转子作用是( )。
①
发出三相交流电动势
②
产生磁场
③
变交流为直流
参考答案：
复制
纠错
相关题目
【单选题】
三相交流电路：由三个频率相同、最大值(或有效值)相等，在相位上互差( )度电角的单相交流电动势组成的电路，这三个电动势称为三相对称电动势。
①
45
②
60
③
90
④
120
随机题目
【单选题】
For formal English, we’d better NOT choose_______.
①
words of glorification
②
verbs of action
③
words of strength
④
peculiar words
【单选题】
“in addition to”is a/an_______ collocation.
①
noun
②
conjunction
③
preposition
④
adverb
【单选题】
The figure of speech used in “The world is a stage”is_______.
①
simile
②
metaphor
③
paradox
④
allusion
【单选题】
When making a choice of words, speaker/writer needs to consider the following major factors EXCEPT_______.
①
audience
②
length of speech
③
purpose
④
formal and informal English
【判断题】
Homophones are two or more words that sound alike, but look different and have different meanings, such as “sea”and “see”.
①
正确
②
错误
【判断题】
All the free morphemes are lexical morphemes and all the bound morphemes are grammatical morphemes.
①
正确
②
错误
【判断题】
Anglo-Saxon vocabulary is usually regarded as the main body of the English vocabulary.
①
正确
②
错误
【判断题】
When efficiency and formality are in conflict, the fast-paced modern people often sacrifice the latter.
①
正确
②
错误
【单选题】
The sense relation between “fruit”and “apple”is _______.
①
hyponymy
②
polysemy
③
homonymy
④
synonymy
【单选题】
Noticeable changes of English words in recent years consist of the following characteristics EXCEPT___________ .
①
increasing use of abbreviation
②
increasing use of open compounds
③
increasing use of clauses
④
increasing use of conversion