The activity of Na2SO4 can improve the performance of low-active flyash, such as improving the early strength, reducing cracks, shorting construction period and ensuring the construction quality.

用硫酸钠添加剂的方法改善低活性粉煤灰，可以提高二灰碎石的早期强度、减少裂缝、缩短施工周期，并保证施工质量。

youdao

Officials also still not have released any figures for voter turnout, which observers predict may be as low as 10 percent in areas where the Taliban insurgency is active.

VOA: standard.2009.08.23

The Navy disputes his assessment, saying this year's humpback whale season was normal, and more whales than ever before were seen in March 1998, when biologists studied humpbacks' response to the Navy's Low-Frequency Active Sonar (LFAS) equipment in Hawaiian waters.

CNN: waves

Today, there are well over 1, 000 index funds and ETFs that track nearly every stock, bond, and commodity market worldwide, and they do it at very low cost compared to active management.

FORBES: The Odds Favor Index Investors

Thus, a low-volume ETF tracking active stocks can be more resilient to buying and selling than it might appear.

WSJ: No Need to Avoid All Low-Volume ETFs