晏阳初认为中国普遍存在四大社会病,即“愚、贫、弱、私”,要解决这些问题,必须要进行()教育。
A.文艺教育
B.生计教育
C.卫生教育
D.公民教育
参考答案:A, B, C, D
An internet is a combination of networks connected by () .When a datagram goes from a source to a () ,it will probably pass many () until it reaches the router attached to the destination network.A router receives a () from a network and passes it to another network.A router is usually attached to several networks.When it receives a packet,to which network should it pass the packet The decision is based on optimization: Which of the available () is the optimum pathway.
When a datagram goes from a source to a ()
A.user
B.host
C.city
D.destination
下图为细胞有丝分裂某一时期图像:
图乙中的cd段表示细胞分裂进入()期,染色体变化的主要特点是:()