And though several European airlines conducted successful test flights in the danger zone, the engines of a Finnish military jet suffered considerable damage as a result of breathing in the ash.
尽管几家欧洲航空公司成功进行了穿越火山灰区域的测试飞行，但是因发动机吸入火山灰，芬兰一架喷气式战机损失惨重。
This paper introduces the mix proportion of high fly ash content concrete instead of 30% cement with fly ash and some experiment results of the test examples in laboratory.
介绍了在水泥混凝土中，采用粉煤灰替代30 %水泥的高掺量粉煤灰混凝土的配合比设计，以及试件力学性能的室内实验结果。
Laboratory test showed that: In consideration of slump, the optimization content of the fly ash was around 30% or more than 30%.
试验结果显示：从坍落度方面考虑，粉煤灰的掺量应该在30%左右或大于30%为最佳。
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