Please select the most similar patent number from A, B, C and D. Which number is?
A lightweight foldable mobility scooter provided with front, rear, left and right lifting handles. The scooter comprises a scooter bottom plate (1), wherein two sides of the scooter bottom plate (1) are respectively provided with a scooter bottom plate lifting handle (2); the two scooter bottom plate lifting handles (2) are respectively located at two sides of the scooter bottom plate (1), and are positioned at the center of gravity after the mobility scooter is folded; and a scooter head lifting handle (3) is provided at a scooter head of the scooter bottom plate (1), and a tail portion of the scooter bottom plate (1) is provided with a scooter tail groove portion (4) used for cooperating with the scooter head lifting handle (3) for carrying.
A: Disclosed is a chassis collision structure for a new energy vehicle, the chassis collision structure sequentially comprising, in the direction from the front of the vehicle to the rear of the vehicle, a front lower anti-collision beam assembly (1), a front subframe assembly (2), a front battery pack lower protection plate (3), a rear battery pack lower protection plate (6), and a rear subframe assembly (5), wherein the front lower anti-collision beam assembly (1) is connected to the front end of the front subframe assembly (2); the front battery pack lower protection plate (3) is connected to the bottom of the front subframe assembly (2); the rear battery pack lower protection plate (6) is connected to the bottom of the rear subframe assembly (5); and two ends of the front battery pack lower protection plate (3) and the rear battery pack lower protection plate (6) that are close to each other are respectively provided with a connection portion connected to a battery pack (8). According to the new energy vehicle chassis collision structure, a collision system is formed at the position of the chassis of the vehicle, and can guide the structure of the chassis to generate or increase deformation in a particular area so as to improve the collision performance of the chassis of the new energy vehicle.
B: A foldable balance vehicle, comprising wheel mechanisms (1), a foot board mechanism (2), folding apparatuses, and balance devices (22), the foot board mechanism (2) is a sunken down-type foot board mechanism mounted at lower parts of the wheel mechanisms (1), two sides of a left foot board (23) and a right foot board (24) are both provided with balance devices (22), each wheel mechanism (1) is provided with a folding apparatus, each folding apparatus comprises a rotating folding mechanism and a locking mechanism, each locking mechanism comprises a locking mechanism mounted on the foot board mechanism (2), one end of each rotating folding mechanism is rotatably connected to a wheel mechanism (1), and the other end is rotatably connected to the foot board mechanism (2); the wheel mechanisms (1), by means of the rotating folding mechanisms, can be turned and folded to fit under the foot board mechanism (2). The sunken down-type foot board has a lower center of gravity, the folding apparatuses allow each wheel to be independently folded, which lowers folding difficulty, and when folding, only a relatively small amount of force is needed to fold the wheels; upon folding, the wheel fits close to the foot board, which reduces space needed for storage, and the wheels are balanced under the foot board, achieving more stable placement compared to opposingly folded-type balance vehicles.
C: A locomotive structure for an electric multiple unit. In the locomotive structure for an electric multiple unit, the tail ends of a first side wall (1), a second side wall (2), and a roof (4) are all connected to a ring frame (5); a group of first main lengthwise beams (6) are provided at each of the intersection between the first side wall (1) and the roof (4) and the intersection between the second side wall (2) and the roof (4); each group of first main lengthwise beams (6) extend from a front wall (3) of the locomotive structure for an electric multiple unit to the ring frame (5); multiple second main lengthwise beams (7) arranged side by side are provided below a window on the first side wall (1) and below a window on the second side wall (2), separately; a second main lengthwise beam (7) is separately provided at a position at the lower part of the first side wall (1) for connection to the underbody and a position at the lower part of the second side wall (2) for connection to the underbody; each of the second main lengthwise beams (7) extends from the front wall (3) to the ring frame (5); multiple parallel vertical beams (8) are provided on each of the first side wall (1), the second side wall (2), and the roof (4), and the vertical beams (8) are perpendicular to the traveling direction of the electric multiple unit.
D: A pet cage having a movable push-pull base plate comprises a pet cage frame (1), a movable base plate (2), side plates (3), and a top plate (4). The side plates (3) are respectively fixed to front, rear, left and right portions of the pet cage frame (1). The movable base plate (2) is movably disposed at a bottom portion of the pet cage frame (1). The top plate (4) is fixed to a top frame portion of the pet cage frame (1). Two side edges of the movable base plate (2) are provided with movable guide wheels (5). Two inner sides of a bottom frame portion of the pet cage frame (1) have guiding grooves fitting with the guide wheels (5). A lower portion of the movable base plate (2) is provided with a caster structure (6). The movable base plate (2) is freely movable forward and backward within the bottom frame portion of the pet cage frame by means of the guide wheels (5) and the guiding grooves.
Answer: B