The new developed HF high-performance grouting stuffing has such properties as high early strength, high-strength and durability so as to provide grouting with relatively great anchoring strength.
研制的HF高强灌浆料具有早强、高强、耐久性好等特点，使灌浆料具有较强的锚固能力。
The ionosphere contamination imposing on the High-frequency(HF) radar echoes has to be suppressed since it severely degrades the detection performance of HF radar.
高频雷达回波信号受到电离层污染从而影响了雷达的探测性能，因此需要进行去污染处理。
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