Yes, but it is expensive and a bit of a hassle:
1) You ask for a form for a letter of recommendation from the ECCS.
2) You ask Prof. Zhang Xiucheng of the Zhexuexi to sign it off.
3) With your Student-ID and this letter you go to the PKU IT Center (Jisuan zhongxin 计算中心, map) near the ECCS office and apply (opening hours 8-11:30, 13-16:30). For this service you have to pay the hefty sum of RMB 110 per month in advance (for as many months as you plan to use it)