一个正常人的平均心跳速率约为每分钟70次，4小时大约跳______次．（结果用科学记数法表示）
70×60×4=16 800=1.68×104次．
He was a much older tennis player, but he had a (n) _______ over other players in experience. [ ]
A. profit
B. power
C. advantage
D. benefit
根据网络拓扑和需求说明，解释路由器R2的GRE隧道配置。 … R2(config)#interface tunnel 0 (启用tunnel 0) R2(config-if)#tunnel source s1/0 (9) R2(config-if)#tunnel destination 200.100.1.1 (10) R2(config-if)#ipv6 address 2000:2fcc::2/64 (为tunnel配置IPv6地址) R2(config-if)#tunnel mode gre ipv6 (11)
_____ over other players in experience. [ ]