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|  | | 为了更好的帮助您理解掌握查询词或其译词在地道英语中的实际用法,我们为您准备了出自英文原文的大量英语例句,供您参考。 | |
An alternative is to have pressure pan readings less than 1 Pa.
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| | For drill holes riched in autoflowing ground water or pressure water of a large flow rate, conventional water shut-off methods often cease to be effective. It is suggested that a device by compressing the sea tangle or rubber balls may be used to achieve good results for this purpose. The device comprises a down-hole pressure disc. with the aid of the rotating drilling rod the disc moves downward to press the sea tangle or rubber balls and the expansion of which exert a radial force to compact tightly the h... | | 在地下水丰富的自流钻孔和大流量的承压水钻孔中,常规止水法往往失效。文中推荐的压缩海带止水器或压缩胶球止水器,可方便而有效地进行孔内止水。这两种止水器的原理,都是借助于钻杆回转,移动井下压力盘,压缩海带或胶球,使之产生径向扩张,挤紧孔壁。 | | 文摘来源 | |   |
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