【单选题】现阶段工业生产所需的微生物菌株一般不通过以下哪种途径获得?( )
D.
对菌种的性能进行遗传改良对环境较为敏感的菌株不适用于工业生产。
【简答题】The author seems to believe that the US will have positive outcomes in Iraq if [A] enough security can be obtained after the war on terrorism. [B] troops in Iraq take no further military actions. [C] ...
【判断题】弹性柱销联轴器将若干非金属材料制成的柱销置于两半联轴器的 凸缘孔中,从而实现两半联轴器的连接。常用的柱销材料为尼龙。
【判断题】河流某一过水断面以上的集水区域称为河流在该断面的流域。
【简答题】每条河流的集水区域称为该河的________。
【单选题】The project will have to be given up _______________ the government agrees to invest enough money.
【单选题】With larger numbers of undergraduates than ever before, just having a degree will no longer be enough to make you ___ from the crowd.