Please select the most similar patent number from A, B, C and D. Which number is?
A smart household security system on the basis of the Internet of things comprises a central platform server (1), an LAN communication module (2), a security company alarm server (3), an account number manager (31), a receipt module (32), a positioning module (33), a VPN communication module (4), a storage cloud end (5), a data storage module (51), a time axis log module (52), an operator communication module (6), a short message notification module (61), a telephone notification module (62), a handheld client (7), a communication module (8), a wireless gate access control system (9), a smog sensor (10), a web camera (11), a wireless alarm probe (12), an alarm output signal lamp (13), and a monitoring module (14). The alarm device is connected to the platform service; because the web camera (11) is used, real-time video check is supported; an alarm position can be accurately reported by means of the positioning module (33) when an alarm event occurs, and corresponding household information is provided to the working staff; by arranging the storage cloud end (5), the system has a mass storage capability, all alarm data in 3 to 5 years can be effectively stored, thereby facilitating searching and reading.
A: A weather clock that can automatically correct time comprises: a main control module, a time base module (1) used for implementing a timing function, a communication module (3) used for accessing an Internet network (2) so as to connect to a server, a display module (4) and a power supply module (5), wherein the main control module comprises a processor (6) and a storage unit (7), and the processor (6) is connected to the storage unit (7), the time base module (1), the communication module (3) and the display module (4) in communication mode respectively. The processor (6) periodically obtains standard time on the Internet network (2) through the communication module (3), transmits the standard time to the time base module (1) for time correction, obtains weather information on the Internet network (2) in real time, stores the weather information in the storage unit (7) and displays the time and the weather information through the display module (4).
B: Disclosed is a security operation and maintenance monitor, comprising a monitoring host (1), an operation host (7) and a display (8), wherein a video monitoring system (2), an access control management system (3), a voice intercom system (4), a theft prevention alarm system (5) and a tailing prevention door system (6) are arranged at a terminal of the monitoring host (1); the operation host (7) is arranged at the front end of the monitoring host (1); the display (8) is arranged at a terminal of the operation host (7); a power supply module (11) is arranged at external ends of the monitoring host (1) and the operation host (7); and a wireless gateway (9) and a wireless communication network (10) are respectively arranged between the monitoring host (1) and the operation host (7). The security operation and maintenance monitor can achieve real-time online monitoring and safety management for network monitoring cameras, storage devices, alarm hosts (including protection area monitoring), access control systems (door opening and closing), intercom devices, etc. in the system, and can quickly lock a problem device and visually reflect same on an interface of the system so that problems are discovered in a timely manner.
C: An automatic smog control and air management and control system of Internet of Things comprises a purification host, a data host, a smog control host, and a software platform server. The purification host is an air purifier and comprises a power supply module, the purification host is connected to the smog control host, and the power supply module supplies power for the purification host and the smog control host. The smog control host comprises a smog sensing module, a sound-light alarm module, and a local area network module, and the smog control host controls the operation of the purification host; the smog control host is further provided with an identification interface. The data host comprises a display screen, a local area network communication module, and an Internet module, the local area network communication module being connected to the local area network module of the smog control host, and the Internet module being connected to the software platform server. The present invention has the features of real-time monitoring and abundant data, can give a sound-light alarm and automatically purify the air under corresponding situations, can further provide comprehensive information to the smog control and environmental management department for ease of management and treatment, and finally can deal with emergent and sudden conditions regarding the air.
D: A GIS-based remote distributed monitoring system, comprising a central server, a substation server, a communication module, a positioning module, a display module, a central memory, a substation memory, a GIS module and a front-end monitoring device. The central server receives data of the positioning module and the front-end monitoring device, and stores the data into the central memory. The substation server receives the data of the positioning module and the front-end monitoring device in an affiliated monitoring area, and stores the data into the substation memory. The positioning module and the communication module are mounted on the front-end monitoring device separately. The display module is configured to input a command, and display called information in the central server. The GIS module calls position information in the central server, and displays the position information on an electronic map dynamically. By means of the two-stage structure design of a monitoring center and a monitoring substation, the safety redundancy of a system is improved, and the distribution situation of a front-end monitoring device is visually displayed using a GIS module.
Answer: B