In this paper we present the principle and technique for measuring velocity of elastic waves in the bedrock with deep holes, and the effective watertight and pressure-proof measures taken.

本文介绍了基岩深孔的弹性波测试原理和测试技术及深孔测试中所采取的有效防水防压措施。

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By partial carbonation of active lime, its pressure resistance and deliquescence proof capability can be prominently improved and in the meanwhile, its activity is lowered to some extent.

对活性石灰进行部分钝化反应，其抗压强度和抗潮解性能有明显的提高，活性有所下降。

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A new ammonia synthesis catalyst with rare earths, which is suitable for condition of low temperature and low pressure, highly activated and poison proof, is introduced.

介绍一种新型稀土氨合成催化剂，它具有低温、低压、高活性、高抗毒性。

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Worse, now that their bad technique still produced good shots, poor players had less incentive to put in the hard work needed to groove mechanically sound, pressure-proof and ultimately satisfying swings.

FORBES: The Only New Year's Resolution That Really Matters