共同降至零关税产品清单（根据中国海关关税税则） ... 25120010 Kieselguhr 硅藻土 25120090 Other siliceous earths 其他硅质化石粗粉及类似的硅质土 25131100 Pumice stone, crude or in irregular pieces 原状或不规则碎块状浮石 ...
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UWB signals and their power spectrum mask are important factors which need to be considered when studying the spectrum coexisting and compatible problems between UWB systems and other radio systems.
超宽带(uwb)信号及其功率谱分布是研究超宽带通信系统与其它通信系统频谱共存与兼容问题时，需要考虑的重要因素。
To get the better result of seismic wave propagation, the artificial boundary reflections, stability, numerical dispersion and other problems must be considered in the numerical simulation.
为了得到更好的模拟效果，在模拟的过程中，必须考虑人为边界反射以及稳定性、频散等问题。
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