举高消防车使曲臂与伸缩臂之间夹角大于10°时，应能够限制曲臂伸缩。
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《电梯监督检验和定期检验规则》对导轨的安装有哪些技术要求？
商家未按服务时效承诺履行大家电只换不修服务的，需向消费者支付（）元的违约金。
A. 30
B. 50
C. 60
D. 100
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
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