问题
单项选择题
停车后空气罐压力迅速下降（30分钟气压降超过0。1MP），可能出现的原因是下面哪一个（）
A、气制动阀进气门被脏物卡住或损坏
B、空气的罐进气口单向阀不密封或压力控制器有封
C、A、B都对
答案
参考答案：C
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停车后空气罐压力迅速下降（30分钟气压降超过0。1MP），可能出现的原因是下面哪一个（）
A、气制动阀进气门被脏物卡住或损坏
B、空气的罐进气口单向阀不密封或压力控制器有封
C、A、B都对
参考答案：C
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| I love music.Young people today may not know Zhu Mingying. But I know she was very famous more than twenty years _ 1 . She was a dancer at first. But one day she thought that she could also sig 2 . So she went to visit a music teacher. The teacher 3 her to sing a few songs and then said that she would not be successful in singing, 4 she didn't have a good voice. 5 Zhu Mingying didn't give up. She spent a lot of time _ 6 _ to music lessons. She had 7 time to rest. She didn't have much money to by 8 delicious food.Life was really hard for her at that time,But she didn't complain about anything. Insted, she felt happy because she proved that she could be a good singer at last 9 she practiced singing for many years. If you want to do something, just_10__. You'll be successful in the end! | |||
| ( )1. A.ago ( )2. A. good ( )3. A. asking ( )4. A. so ( )5. A. And ( )6. A. going ( )7. A. a little ( )8. A. herself ( )9. A. before ( )10. A. have music lessons | B. before B. better B. asks B. but B. So B. to go B. few B. hers B. after B. try your best | C. later C .best C. asked C. because C. But C. went C. a few C. him C. and C. find a teacher | D. after D. well D. to ask D. why D. When D. gone D. little D. the teacher D. so D. spend little money |