问题
单项选择题
ZG80-1500型电力机车的13#电空接触器在串联运行和电制动运行时是起组合（）。
A.牵引电动机
B.起动制动电阻
C.过渡电阻
D.制动终止电阻
答案
参考答案：B
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ZG80-1500型电力机车的13#电空接触器在串联运行和电制动运行时是起组合（）。
A.牵引电动机
B.起动制动电阻
C.过渡电阻
D.制动终止电阻
参考答案：B
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| From Monday to Friday most people are busy working or studying, but in the evenings and weekends they are free and 1 themselves. Some watch TV or go to 2 , others 3 sports. There are many different 4 to spend our 5 time. Almost everyone has some 6 of 7 , it maybe something from 8 stamps 9 model planes. Some hobbies are very 10 . I know a man who has a coin (硬币) collection worth several 11 dollars. He was very happy about this collection. He has been 12 coins 13 twenty years. On the other hand, my youngest brother collects match boxes. He 14 almost all of them. 15 match boxes is his favorite.
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