问题
单项选择题
直流电动机起动时，由于（），故而起动电流与起动转矩均很大。
A、转差率最大
B、负载最少
C、反电动势尚未建立
答案
参考答案：D
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直流电动机起动时，由于（），故而起动电流与起动转矩均很大。
A、转差率最大
B、负载最少
C、反电动势尚未建立
参考答案：D
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| Jane raced onto the train platform and asked a porter, "Is this the train to Rochester?" "Yes," said the porter, "but only the Hey! Wait." He was too 1 . Jane had raced off 2 he had finished speaking. She had just 3 herself in  a seat when the train 4 out of the station. Jane got out her book and settled down to read. After about an hour or so, she looked 5 and glanced out of the window. "That's 16 ." she thought. "the landscape(景色)doesn't look 7 ,and it should; I've 8 this route so many times." She was getting 9 when the big, red-faced conductor walked up and asked for her 10 . One glance was enough. He 11 his head in friendly reproach(责备) and said, "Now, young lady, what did you do a fool thing like that for? This is the 12 ticket. You 13 have sat at the back of the train. The Rochester-bound(开往) section was 14 at the last station.  Jane's face grew red. "I'm sorry," she said, "I guess I was in too much of a 15 to find out…"Well," said the conductor, "don't 16 . You shouldn't have been in such a hurry, but I dare say we can 17 you a train going in the right 18 at Syracuse. You'll be a couple of hours late 19 , though." When Jane finally stepped onto the Rochester platform, her mother 20 up to her . "Oh, Jane, we have been so worried. What on earth happened?" "Well, Mom," said Jane, "it's a long story......." | ||||
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