Paʻa ka hui i ka hoʻomohala ʻana a me ka hana ʻana i nā mea lapaʻau kiʻekiʻe, pololei, a ʻokiʻoki.Ma muli o ka mākeke me kahi hoʻomaka kiʻekiʻe, kiʻekiʻe kiʻekiʻe, a me ka inoa kiʻekiʻe.ʻO ka hana ʻoihana, nā kikoʻī a me nā hiʻohiʻona i loaʻa, me ka lako lako o nā waiwai.
ʻO ka hōʻoia ʻana i ka maikaʻi maʻamau o ka National, ka mea hana lawelawe hoʻoheheʻe hoʻokahi, nā kikoʻī piha, kākoʻo i ka hana maʻamau, a hoʻokō i nā pono o nā papahana like ʻole.
Hoʻolaʻa ʻo Hengze i ka hana ʻana i nā huahana maikaʻi loa.ʻO kā mākou hale hana hana kūikawā i ka hana ʻana i nā mea geotechnical no nā makahiki he nui, e hōʻiliʻili ana i ka ʻike waiwai a me ka ʻenehana.Hana maikaʻi ʻia nā huahana, me ka hana maikaʻi loa, ka pale ʻana i ka wā kahiko, a me ka pale ʻana i ka corrosion.
Paʻa ka ʻoihana i ka hāʻawi ʻana i nā mea kūʻai aku ma ka honua holoʻokoʻa me ka laulā o nā mea momona kiʻekiʻe, organosilicon, organik peroxides, a me nā kemika kūikawā ʻē aʻe, nā kemika maʻamau, a me nā hopena kemika.