Humic acid (HA ) was abstracted from leonardite,and a composite superabsorbent (HA PSA ) was prepared by compounding poly (acrylic acid ) and lignitic humic acid.
以风化褐煤为原料

植
(HA),将HA

型保水剂(PSA)复合,获得HA型保水剂(HA-PSA)。
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(Time) 

业演讲 High rates of infant mortality and long-standing cultural practices of infanticide and abortion which were not made illegal in the Kingdom until 1835 and 1850 respectively further compounding on the other downward pressures faced by the population.
婴儿死亡率以及长
存在的杀婴和堕胎文化习俗,分别直到 1835 年和 1850 年才在王国被定为非法,进一步加剧了人口面临的其他下行压力。