Road traffic control . traffic signalled juction . principles of maintenance 道路交通管理.交通信号站.维护原则
2.
The expression of topoisomerase ii of cultured cells treated low dose ionizing radiation decreased and then returned as time went . and become outstanding as radiation dose and frequency were added . inhibitor of topoisomerase ii could cause chromosome non - dis juction in mitosis and meiosis . and the co - effect of inhibitor of topoisomerase ii and ion 05 ） ，具有随照射次数增加而增加的趋势；小剂量电离辐射可以引起拓扑异构酶a表达变化，随照射后时间延长先下降后回升，随照射剂量和次数的增加，变化更加明显；拓扑异构酶11a抑制剂可引起有丝分裂和减数分裂时染色体的不分离；拓扑异构酶a抑制剂和电高辐射的协同作用使染色体不分离更加明显。
