2岁以内乳牙的数目约为
A．月龄减2～4B．月龄减4～6C．月龄减6～8D．月龄减8～10E．月龄减10～12
参考答案：B
在1Gbps以太网上采用（）技术，目的是为在半双工模式下扩展碰撞域，达到增长跨距的目的。
—The population of India is ______ than ______ China.
—Right. Developing countries should control the population. [ ]
A. bigger; in
B. fewer; of
C. fewer; that of
D. smaller; that of
