(100) whether to go with a shared or switched fast LAN technology once you start to max out your shared Ethernet of token-ring LAN is tough call. Users and analysts involved in (101) high-speed LANs have learned the benefits of each. However, there are trade-offs to each, and (102) which fast LAN technology to choose is critical for (103) network performance problems and (104) costly purchasing mistakes.

104（）

A.avoiding

B.clipping

C.choosing

D.deciding

E.dissolving

F.ensuring

G.evolving

H.implementing

I.Knowing

J.solving

甲、乙两球在光滑水平轨道上同向运动，已知它们的动量分别为p_甲=5 kg·m/s，p_乙=7 kg·m/s，甲追乙并发生碰撞，碰后乙球的动量变为p_乙'=10 kg·m/s，则两球质量m_甲与m_乙的关系可能是[ ]

A．m_甲=m_乙

B．m_乙=2m_甲

C．m_乙=4m_甲

D．m_乙=6m_甲