在汽车行驶中，不宜采用发动机牵阻作用来制动的情况是（）。
A. 冰雪路面
B. 潮湿路面
C. 紧急制动
D. 下坡行驶
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Which statements are true about EIGRP successor routes?（）
A successor route is used by EIGRP to forward traffic to a destination.
B. Successor routes are saved in the topology table to be used if the primary route fails.
C. Successor routes are flagged as "active" in the routing table.
D. A successor route may be backed up by a feasible successor route.
E. Successor routes are stored in the neighbor table following the discovery process.
F. Successors are not used in EIGR
视频监控系统中以下哪些是图像压缩方法：（）。
A. MPEG4
B. 264
C. XML
D. JPEG－2000
E. DDE
对液压系统中的压力、流量或流动方向进行控制或调节的装置有（）。
A. 能源装置
B. 溢流阀
C. 换向阀
D. 液压马达
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