问题
单项选择题
列车简略试验要求，列车制动管达到定压后，机车制动阀减压（）100kPa，保压1min，列车管漏泄不大于20kPa。确认最后一辆车制动后，进行缓解并确认制动机缓解作用良好。
A.20
B.50
C.100
D.170
答案
参考答案：C
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列车简略试验要求，列车制动管达到定压后，机车制动阀减压（）100kPa，保压1min，列车管漏泄不大于20kPa。确认最后一辆车制动后，进行缓解并确认制动机缓解作用良好。
A.20
B.50
C.100
D.170
参考答案：C
| 阅读理解。 | ||||
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| 1. After reading the poster of Shamrock High School Band, we can know that ______. A. it needs four musicians B. it needs musicians who can play the guitar C. the place of the band is in Room 201 D. we can go there every Friday after school 2. If you like running, you must be interested in ______. A. Shamrock Track & Field B. the Computer Club C. Shamrock High School Band D. the Writing Club 3. If you are the teacher of the Computer Club, you may want to invite ______ to be your guest. A. Bill Gates B. Michael Jordan C. Michael Phelps D. Hillary Clinton 4. If you want to be a writer, you can go to the club ______. A. every Tuesday and Thursday B. every Friday after school C. on Wednesdays at 4:30 p.m. D. on Mondays after school 5. What's the main idea of the passage? A. It's the introduction(介绍) of four different films B. It is the introduction of four different clubs. C. It's the introduction of four different jobs D. It is the introduction of four different schools |