What is the purpose of the inverse ARP?（）
A. to map a known DLCI to an IP address
B. to map a known IP address to a MAC address
C. to map known SPID to a MACaddress
D. to map a known DLCI to a MAC address
E. to map a known IP address to a SPID
F. to map a known MAC address to an IP addre
WCDMA业务生活商务类包括：（）、手机搜索、即时通信等；
货物列车每百吨列车重量的高摩合成闸瓦压力最低为（）kN。
A. 200
B. 230
C. 260
D. 180
吊装柱子时,首先将柱子中线对准杯口上的轴线,而后轻轻放下。
A. 正确
B. 错误
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