LLC层提供两种传输模式：有证实传输模式和无证实传输模式，其中信令和短消息必须以（）

(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

浮选泡沫是固、液、气三相组成的矿化泡沫。

Please put away your clothes hanging outside. As you know, dark clouds______ heavy rain.

A．admit

B．promise

C．present

D．permit

与X-CT比较，SPECT局部脑血流显像诊断缺血性脑病时对下列哪些情况更具优势( )

A．TIA

B．腔隙性脑梗死

C．超过48/小时的脑梗死灶

D．48小时以内的脑梗死灶

E．对脑瘤术后肿瘤复发与瘢痕形成的鉴别诊断

最大残留允许量（MRL）