Advanced warning of restricted headroom may be given by a restricted headroom ahead warning sign with a supplementary plate showing the distance to the restriction.
前面有通行高度限制的警告标志，用以预先警告驾驶人，并有辅助标志牌，说明限制生效的地点距离有多远。
2
Its restrict conditions include system work cycle, communication protocol restriction, communication format assumption, multi-byte data and bit sign.
其约束条件包括系统工作周期、通信协议约束、通信格式约定、多字节数据及位标记。
3
After you sign in to the complete interface, we identify you as the real owner of the mailbox; then, you can operate the mailbox freely without any restriction.