This research has been in progress since 1961 and has yielded a great number of positive results.
这项研究自1961年以来一直在开展，已经取得了大量的积极成果。
On the foundation of experiment, a research has been in progress on the compound desulphurization technology and device of purifying smoke gas of burning coal by calcium blowout and water bath.
在实验测试基础上，对燃煤烟气喷钙水浴复合脱硫工艺及设备进行了研究。
Some exploration has been in progress in the field of modern design method for machine tool.
在机床现代设计方法的领域中进行了探索。
The theoretical study for drilling string has been in progress for many years, but the real working state of drilling string still remains to be solved.
对钻柱在井下的受力状况已进行过许多理论研究，但对钻柱在井下的实际工作状态的研究还不多。
The theoretical study for drilling string has been in progress for many years, but the real working state of drilling string still remains to be solved.
对钻柱在井下的受力状况已进行过许多理论研究，但对钻柱在井下的实际工作状态的研究还不多。
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