Which statement is true about the comparison of voice traffic with video traffic？（）
A. Video conferencing traffic tends to be much more bursty in nature and is more prone to have an impact on other traffic flows.
B. Latency requirements are less stringent for video traffic than for voice traffic.
C. Video traffic is less sensitive to dropped packets than for voice traffic.
D. Video traffic requires the retransmission capabilities of TCP whereas voice uses UD
E. Voice traffic tends to be much more bursty in nature and is more prone to have an impact on other traffic flows.
F. Voice traffic requires the retransmission capabilities of TCP whereas video uses UD
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关于ORACLE下面有关序列的说法，正确的是（）
A. 序列可以在表中插入值时，可以使某列的值按一定的幅度增长
B. 序列是可用于按照设定的规则自动产生数据的方案对象
C. 序列的操作不能在企业管理器中进行
D. 序列创建可以用CREATE SEQUENC
螺钉旋具是用来（）或（）螺钉的工具，其头部形状分为（）形和（）形两种。
皮亚杰认为，儿童的游戏发展水平与智力发展相应，主要有三种类型的游戏（）。
A. 练习游戏
B. 角色游戏
C. 规则游戏
D. 结构游戏
If the compression rings on a diesel engine piston become stuck in the ring groove, the cause may be due to（）
A. excessive ring action
B. excessive ring temperature
C. improper ring rotation
D. excessive ring face wear
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