问题
单项选择题
标准孔板的开孔直径d是一个重要尺寸，应该进行实测；实测时，至少要测4个直径，要求任一单测值与平均值之差不得超过（）
A.0.05%
B.0.10%
C.0.15%
D.0.20%
答案
参考答案：A
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标准孔板的开孔直径d是一个重要尺寸，应该进行实测；实测时，至少要测4个直径，要求任一单测值与平均值之差不得超过（）
A.0.05%
B.0.10%
C.0.15%
D.0.20%
参考答案：A
| 阅读理解。 |
| Once three men got to the Dover station at about nine o'clock that evening. One of them asked a porter (行李搬运工) what time the next train for London was. The porter answered,"You have just missed one. They go hourly. The next train is at ten." The three men decided to go off the station. So they went to a bar. A minute or two after ten o'clock they came running into the station. The porter told them the train had just gone. So they went back to the bar, They missed the eleven o'clock train in the same way. The porter said,"Now the next train is the last one, if you miss that, you won't get to London tonight." Twelve o'clock came, and the last train was starting out when all of the three ran to catch the train as fast as they could. Two of them went into a carriage (车厢), but the third of them didn't run fast enough. The train went out and left him behind. He laughed until tears came into his eyes. Then he caught hold of the porter's hand and said,"Well, I myself have to go to London, and they only came here to see me off." |
| 1. At Dover station, train went to London . |
[ ] |
| A. at about nine o'clock every morning B. only once a day C. every hour D. in a minute or two after ten o'clock |
| 2. The three men didn't catch up with the nine o'clock train. So they decided to go off the station and to . |
[ ] |
| A. get the tickets B. get the drink C. take a walk in the street D. make a phone call in the bar |
| 3. The last train didn't start out until it was . |
[ ] |
| A. the next day B. time for sleep C. a minute or two after 10 o'clock D. the middle of that night |
| 4. missed the last train for London. |
[ ] |
| A. The third of the three B. The friends of the third man C. None of the three men D. All of the three |
| 5. Which of the following is true? |
[ ] |
| A. The third man didn't run as fast as the other two. B. The third man changed his mind and didn't want to leave. C. The train didn't start off on time. D. The third man laughed for he was glad to see his friends off. |