Please select the most similar patent number from A, B, C and D. Which number is?
A mobile controlled atmosphere container for fruit and vegetables, comprising a container body (1) having a rectangular cabinet structure, the container body (1) being sequentially provided with an equipment chamber (3) and a storage chamber (2) in the length direction thereof; equipment doors (5) are respectively provided at the left side and the right side of the equipment chamber (3); the storage chamber (2) has a thermal-insulation and sealed structure, the end of the storage chamber away from the equipment chamber (3) is provided with a sealing door (4), and one side of the storage chamber (2) is provided with a sampling door (6); a sealing film (8) connected around the frame of the sampling door (6) and a sampling assembly (7) connected to the sealing film (8) are provided in the storage chamber (2) at a position corresponding to the sampling door (6), the sealing film (8) having a cylindrical structure; said mobile controlled atmosphere container further comprises a controlled atmosphere control system comprising a control panel, and a refrigerator, a humidifier, a sterilization device, a nitrogen generator, a carbon dioxide removal device, an ethylene removal device, a temperature and humidity sensor, and a gas concentration sensing device which are connected to the control panel.
A: A fully automatic intelligent pH value detection device, comprising a reaction kettle (2) and a detector (3), wherein a first mechanical arm (7) can grasp a container on a conveyor belt (6) and enables a sampling port (1) to extend into the container, so as to complete sampling; one end of the conveyor belt (6) close to the reaction kettle (2) is provided with a film coating and sealing device (8); and the film coating and sealing device (8) can cover an opening of the container with a sealing film, so as to seal a sample in the container. By automatically completing a series of operations such as sampling, sample delivery, pH detection, etc. of the sample in the reaction kettle, and sealing and storing the sample during the operation process, the sample is prevented from reacting with outside components during the operation process, and additionally, harmful gas or highly irritating gas in the sample is prevented from being emitted, and the working efficiency and the detection accuracy are also improved, thereby making the detection process safer, and ensuring the healthiness of workshop staff.
B: A refrigerator (100), comprising a refrigerator body (1), a drawer seat (2), a drawer body (3), at least one air-conditioning membrane assembly (7), and an air extractor (8). A low-temperature storage space (14) is formed in the refrigerator body (1), the drawer seat (2) is provided in the low-temperature storage space (14), and the end of the drawer seat (2) distant from a rear side wall (13) of the refrigerator body (1) is open and hollow; the drawer body (3) has a storage cavity (4) mounted in the drawer seat (2); a mounting cavity (5) and a backflow cavity (6) communicated with each other are defined between the drawer body (3) and the drawer seat (2); the mounting cavity (5) and the backflow cavity (6) are respectively provided on the different sides of the drawer body (3), and are respectively communicated with the storage cavity (4); the air-conditioning membrane assembly (7) is provided in the mounting cavity (5), and an oxygen transmission rate thereof is greater than a nitrogen transmission rate; and the air extractor (8) is provided in the low-temperature storage space (14) and configured to suction air in the air-conditioning membrane assembly (7), so that the air in the storage cavity (4) enters the mounting cavity (5), passes through the air-conditioning membrane assembly (7) in the mounting cavity (5) for deoxidization and filtration, and flows back to the storage cavity (4) through the backflow cavity (6), and the air in the drawer seat (2) is deoxidized and filtered by means of cyclic flowing, thereby greatly improving the air conditioning efficiency.
C: Provided is a combustion-supporting oil-economizing device for a gasoline engine. The device comprises: an air inlet filter screen (1) provided with a grid-type air inlet structure (11); a reinforcing support rod (10) fixed on the air inlet filter screen (1), used for reinforcing the air inlet filter screen (1) and being of a cross-shaped structure; a controller (6) fixed on the air inlet filter screen (1) and connected to a storage battery of a gasoline engine; an air inlet pipe (2), a first shock absorption corrugated pipe (3), an air filter (4), a second shock absorption corrugated pipe (5), an ozone generator (7) and a gas inlet manifold (8), wherein same are sequentially connected in the gas inlet direction of the gasoline engine; an MQ-series ozone sensor (9) provided on an inner wall of the gas inlet manifold (8) and connected to the controller (6); and an MQ-series carbon monoxide sensor connected to the controller (6) and used for detecting the content of carbon monoxide in tail gas. Further provided is a control method for the combustion-supporting oil-economizing device for a gasoline engine. The oil-economizing device has a simple structure. The control method for the oil-economizing device is simple and convenient to control.
D: An air purification device comprises a box body (11). An air discharging fan (12) is disposed at the lower end of the right side of the box body (11). An elementary filtering net (7), an enhanced activated-carbon adsorption layer (15), an HEPA high-efficiency refined filtration layer (16), a negative ion air freshening layer (17) and an ultraviolet sterilization lamp (8) are sequentially disposed on the left side in the box body (11) from the left to the right. An air intake pipe (6) is disposed on the outer side of the elementary filtering net (7), the lower end of the air intake pipe (6) is connected to an air intake hood by means of an indoor air intake control valve (14), and a left end of the air intake pipe (6) is connected to an outdoor air intake compartment by means of an outdoor air intake control valve (5). An air intake fan (13) is disposed in the air intake compartment. The air intake compartment communicates with the outside (3) by means of a pipe (4). An outdoor temperature sensor (1) and an outdoor particle substance detection sensor (2) are mounted on the wall of the outside (3). An indoor temperature sensor (18) and a carbon dioxide sensor (19) are disposed at the lower end of the box body (11). The device has a novel structure, stably operates, has a good air purification effect and a high efficiency, and has functions for adjusting the indoor air temperature and the indoor air oxygen content, thereby satisfying use requirements of large indoor public sites.
Answer: B