A branch office of Acme Insurance has 15 IP phones connected to the main office using the distributed call processing model. Normally， the phones work with great quality. However， during very busy times when all of the agents are on the phone at the same time， the voice quality drops precipitously. Words or phrases or both are dropped from conversations. What is the most likely cause of the problem？（） ["large files are being downloaded over the WAN network","IP phone traffic is not being classified correctly","more bandwidth is required for the office LAN","Call Admission Control has not been implemented ","employees are watching videos over the internet","header compression is not being used"]
低压配电系统的保护重复接地电阻不大于（）；接地装置的设计和施工应符合《工业与民用电力装置的接地设计规范》 ["4Ω；","10Ω；","20Ω；","1MΩ。"]
The following access list below was applied outbound on the E0 interface connected to the 192.169.1.8/29 LAN: access-list 135 deny tcp 192.169.1.8 0.0.0.7 eq 20 any access-list 135 deny tcp 192.169.1.8 0.0.0.7 eq 21 any How will the above access lists affect traffic? （） [" FTP traffic from 192.169.1.22 will be denied"," No traffic, except for FTP traffic will be allowed to exit E0"," FTP traffic from 192.169.1.9 to any host will be denied"," All traffic exiting E0 will be denied"," All FTP traffic to network 192.169.1.9\/29 will be denied"]
假设伦敦国际金融期货权交易所的6个月期英镑合约交易单位为500000英镑。一家公司的财务经理以5%的利率借了100万英镑，期限为6个月。6个月后，贷款将会展期，这位财务经理担心那时利率会上升，所以决定卖出6个月的伦敦国际金融期货期权交易所的短期英镑期货，以对冲利率风险。请问：他需要卖出多少份合约？
世界上第一个系统研究了儿童游戏，并把游戏作为幼儿园教育基础的教育家是（）。
两膝并拢时，两脚踝分离，称为（）
