【判断题】根据基因对基因学说,病原物和寄主之间的特异性互作发生在显性的抗病等位基因和显性无毒等位基因之间。只有寄主抗病基因与对应的病原菌无毒基因的互作才能使寄主表现出抗性,没有互作则寄主表现为感病。
【简答题】阅读表达。 The new school term is coming. Now the school clerks are planning a new timetable for Class 7 , Grade 9. There are six classes every day, four in the morning and two in the afternoon. The studen...
【单选题】Now, Wei Fen ______ Class 3 was running very fast.
【简答题】Basically transportation plans for the future are made in the light of economic considerations.
【单选题】This country suffered ______ damage due to the flood.
【单选题】Daming and Lingling are in .
【单选题】在水平角计算中,下面说法正确的是()。
A.
水平角计算取平均值时,数字的取舍采用四舍六入五凑偶的原则
B.
利用方向值计算角度时,永远是大的值减去小的值
【单选题】It’s my ____ opinion that I should go abroad after graduation.