问题
单项选择题
可控整流电路中，（）电路必须有续流二极管才能正常工作。
A、单相半波可控整流
B、三相半波可控整流
C、半控桥带大电感负载
D、全控桥带大电感负载
答案
参考答案：C
搜题请搜索小程序“爱下问搜题”
可控整流电路中，（）电路必须有续流二极管才能正常工作。
A、单相半波可控整流
B、三相半波可控整流
C、半控桥带大电感负载
D、全控桥带大电感负载
参考答案：C
You may think that English dictionaries have been used for many, many centuries. In fact, an English dictionary you today wasn’t made until the Qin Dynasty. They spent most of the important work on dictionaries. They spent nearly all their lives trying to words for their dictionaries. For them, it was a wonderful journey. The largest dictionary in the world is Oxford English Dictionary（牛津字典）. The for this dictionary came from an important meeting in Britain in 1857. twenty-two years later, Oxford University asked James Murray to be the editor（编者）of its new dictionary. Murray had never been to . At the age of fourteen, he left his villageschool in Scotland and taught himself while working in bank. he became a great teacher. After Oxford gave him the job. Murray had a small house in his garden to do the work. Every morning, Murray got out of bed at five o’clock and in the small house several hours before breakfast. Often he would work into the night. Murray hoped to finish the new dictionary in ten years but after five year, he was adding（增加）words for the letter “A”! He worked on the dictionary he was very old. Forty-four years later, in 1928, other editors finished the dictionary.
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