油罐安装呼吸阀挡板(),呼吸的气体上层浓度较低,从而减少蒸发损耗。
A、可以减轻呼吸量
B、能降低阳光的照射
C、使油罐内部空间油气分层
D、使油罐内部的气体充分挥发
参考答案:C
The police were seeking more information to find out _____ the rich merchant. [ ]
A. who was it that killed
B. who it was that killed
C. it was who killed
D. who was it killed
主叫用户为呼叫移动用户所需要的拨叫号码是()
A、TMSI
B、IMSI
C、MSISDN
D、LAI