Plants can accumulate heavy metals form the environment . phytoremediation of cd polluted environment is an available method . zizannia caduciflora and acrous calamus were the accumulating plants of cd 本文研究了植物菰和菖蒲对cd的富集，菰和菖蒲各器官对cd的富集能力不同。
The finger - shaped balanophora emerges from soil during its flowering period from late november to december . the slender lower - part is the stem with tiny leaves . the swollen top - part of the stem is a collection of flowers 这种趣致状似指头的蛇菰，于十一月下旬至十二月花期时从泥土中冒出，茎的下部有小叶片，而茎顶膨胀部分有无数小花聚合。
The importing of silver from abroad promoted chinese markets , and long distance trade sprang up . all kinds of commodities such as timber , mushroom , dry bamboo shoot , ittchi , longan , indigotin , paper , steel , red and white sugar and tobacco as well were exported to domestic markets 海外输入的白银又活跃了中国的市场，长距离贸易兴起，闽潮民众采伐与制造木材、香菰、笋干、荔枝、龙眼、兰靛、纸张、钢铁、红白糖、烟草等商品向国内市场输出，并从江南与广东、江西等地输入棉布、稻米、生丝等商品。
In this paper , the basic and important parts are studied . for example , the capacity of jet fan in tunnel , the flux distribution and resistance loss in the chimney . this approach is capable of modeling multi - dimensional , time dependent nature of fire in a road tunnel , this paper presents the critical ventilation velocity in various heat release rate and smoke release rate for jingfu highway 以京福高速公路美菰林隧道的结构参数为依据，当隧道内发生火灾时，对隧道烟雾随时间的发展扩散过程进行了动态的模拟与研究，得出了不同的火灾放热率、发烟率的情况下，控制隧道烟雾回流的临界风速这一关键数据，为隧道突发火灾时的紧急通风控制提供参考。
