Conclusion NSTL is an internet service institution of technological information with abundant resources,convenience,and lower charge,but there is still a problem that to be solved is limited data-b...

• 结论NSTL是资源比较丰富、使用比较方便且收费较低的一个网上科技文献信息服务机构,但仍然存在着数据库回溯年代短等问题,有待于进一步提高。