问题
单项选择题
一般情况下，待关井后（）min，井眼周围的地层压力才恢复到原始地层压力，此时读到的油压值才是地层压力与管柱内工作液静液柱压力之差。
A、5～10
B、10～15
C、20～30
D、30～45
答案
参考答案：B
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一般情况下，待关井后（）min，井眼周围的地层压力才恢复到原始地层压力，此时读到的油压值才是地层压力与管柱内工作液静液柱压力之差。
A、5～10
B、10～15
C、20～30
D、30～45
参考答案：B
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| Bill Gates 1 on October 28th, 1955. He 2 in Seattle, Washington. His favorite subjects at school were science and math. 3 he was 13 years old, Bill started to play with computers. Computers at that time 4 very large, but he was interested 5 them. He 6 lots of time doing unusual things with computers. In the end, he and some of his friends worked out a software program (软件程序) with an old computer. He 7 it for ＄4,200 dollars. In 1973, Bill 8 Harvard University (哈佛大学). He left there in the third year to work for a company called Microsoft. In 1975 Bill began his company 9 his friend Paul Allen. They developed software for personal computers. They improved (改进) the software to make it 10 for people to use computers. | ||||
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