A:3∶1∶2
B:3∶2∶2
C:1∶1∶2
D:1∶3∶2
They are very glad that most of the people ________ gave very useful answers.
如图为女性排卵、受精和开始怀孕的示意图,请据图回答问题:
20世纪80年代末,印度发展的具有信息技术含量高,利润大,资源消耗少等特点的产业是( )