简述运动员发展耐力素质的注意事项。

A. CoPP protects against IP spoofing；Racl protects against DoS attacks.
B. CoPP can not use named access lists；Racl can use named access lists
CoPP applies to a dedicated control plane interface；Racl applies to all interfaces.
D. CoPP needs a AAA server，Racl does not need a AAA server
E. CoPP supports rate limits；Racl does not support rate limit

A. 试验阳性说明机体接触过相应病原体
B. 单次试验阳性不能完全证明新近感染
C. 试验阴性不能完全排除相应病原体感染
D. 在发病初期和恢复期取双份血清标本检测
E. 双份血清标本，后者抗体效价比前者高即有诊断意义

A. CT
B超
C. 磁共振
D. 腰椎穿刺
E. X线摄片