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Refer to the exhibit. The output that is shown is generated at a switch. Which three of these statements are true? （）
All ports will be in a state of discarding, learning, or forwarding.
B. Thirty VLANs have been configured on this switch.
C. The bridge priority is lower than the default value for spanning tree.
D. All interfaces that are shown are on shared media.
E. All designated ports are in a forwarding state.
F. The switch must be the root bridge for all VLANs on this switch.
S700K提速道岔控制电路的X1线是定反位动作、表示共用线，由反位向定位动作的线还有（）。
A. X2线
B. X3线
C. X4线
D. X5线
男性，25岁，腰痛、腰僵硬，逐渐出现驼背，X线片见骶髂关节模糊，间隙消失，可能诊断为()
A. 慢性腰扭伤
B. 腰肌劳损
C. 腰椎结核
D. 强直性脊柱炎
E. 腰椎间盘突出症
FOCKE350小盒包装机安装大胶缸上胶轮时，应注意左右两端支撑轴，轴承的定位槽是否有积胶。
A. 正确
B. 错误
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