Please select the most similar patent number from A, B, C and D. Which number is?
Disclosed is a land and water flying automobile comprising a shell (3), a chassis (12) and a lower boat body (14), wherein the shell (3) is fixedly provided on the chassis (12), and the lower boat body (14) is connected under the chassis (12); a water rudder (15) and a propeller (16) are provided at the rear lower part of the chassis (12); an upper aerofoil (6) and a rotor (5) are provided at the top part of the shell (3) and fixed on a bearing frame at the centre of gravity of the machine body, and the upper aerofoil (6) is hinged to the shell (3) via a hinged shaft; a strake (10) is provided on the joining point of the shell (3), the chassis (12) and the lower boat body (14); a horizontal wing includes a stabilizer (13) and an elevator (9), respectively provided on the front end and the rear end of the machine body; twin vertical tail wings (7) are provided on two sides at the rear end of the machine body, a root part thereof being fixedly connected to the strake (10); an automobile engine (1) is provided at the front of the chassis (12), and is connected to vehicle wheels (11) and the propeller (16) via a transmission system; an aircraft engine (8) is provided at the rear end of the machine body and is connected to the rotor (5) via a transmission system; and an operating system (2) contains a hydraulic rigid mechanical operating system and a quasi-active control system. The present invention integrates the existing automobile, boat and aircraft technology, achieving a land and water flying automobile able to travel in different media.
A: Disclosed are a flying motorcycle or automobile, and a flying posture adjustment method therefor. Propulsion devices and propulsion device driving apparatuses are arranged on a body of the flying motorcycle or automobile, propellers are mounted within the propulsion devices, and the propulsion device driving apparatuses control the direction of rotation of the propulsion devices. The propulsion devices comprise a left front propulsion device and a right front propulsion device symmetrically mounted at a front left side and a front right side of the body, and rear propulsion devices mounted at the rear of the body. The flying motorcycle or automobile adjusts the flying posture by means of the propulsion device driving apparatuses causing the propulsion devices mounted on the two sides and the rear of the flying device to tilt angles so as to implement steering, forward and backward movement, and left panning and right panning of the flying motorcycle. The present invention enables the flying motorcycle or automobile to constantly maintain a horizontal state during flight, may be applied to manned flight, and has a very wide range of applications.
B: An electric pruner, comprising a machine body housing (28), a machine head main body provided at the front end of the machine body housing (28), and a power cord (29) provided at the back end of the machine body housing (28). A motor (1) is provided inside the machine body housing (28), the motor (1) is connected to a gearbox gear ring (3), the gearbox gear ring (3) is connected to a feed screw nut (19); the motor (1) is connected to a planetary gear (4) by means of a motor gear (2), the planetary gear (4) is fixed onto a planetary gear carrier (5), one end of the planetary gear carrier (5) is connected to a universal joint transmission block (6), a universal joint sleeve (17) is provided at the outer side of the universal joint transmission block (6); a first bearing (7) is fixed onto the planetary gear carrier (5), a first spherical bowl (9), a first ball head (10) and a second bearing (12) are respectively and sequentially fixed to a third bearing (13), a second ball head (14) and a second spherical bowl (15) which are provided on a lead screw (16); the lead screw (16) is fixed onto the machine head main body, the lead screw (16) is provided with a Hall plate (21) at the lower part of the fixing end of the machine head main body, a trigger (20) is provided at the bottom of the Hall plate (21), a magnet (18) is provided between the Hall plate (21) and the lead screw (16); the front end of the machine head main body is provided with a fixed cutter blade (24) and a movable cutter blade (25), the fixed cutter blade (24) is provided at the lower end of the movable cutter blade (25).
C: A flying car, comprising a body (6) and wheels (4). First wing bays (3) and a second wing bay (5) are arranged on the body; folding wings (8) are respectively arranged in the first wing bays and the second wing bay; the folding wing comprises a first folding shaft (16), a second folding shaft (17), and a third folding shaft (18); the first folding shaft, the second folding shaft, and the third folding shaft are arranged in a sleeved manner; a motor box (20) is connected onto the third folding shaft; the motor box is arranged in a rotatable manner with respect to the third folding shaft; a propeller (19) is mounted on the motor box; a propeller drive motor is arranged in the motor box; the propeller is arranged in a folding manner with respect to propeller recesses. Therefore, when the flying car travels on the ground, the folding wings can be rapidly retracted into the first wing bays and the second wing bay, and the first folding shafts, the second folding shafts, the third folding shafts, the propellers, and the motor boxes can be tightly retracted, thereby ensuring that there will be no part of the folding wings extending out of the surfaces thereof when the flying car travels on the ground, and ensuring the safety and service life of the folding wings.
D: A dust suppression vehicle, comprising a vehicle head (1), a chassis (6), a water tank (5), a sprayer (8) and a control system. The water tank (5) is disposed in the middle of the chassis (6). The sprayer (8) is located at the rear of the chassis (6). The sprayer (8) comprises a fan, a water pump (14) and a ventilator (9). The fan comprises fan blades and a fan electric motor (M1). The fan blades are arranged on a rotating shaft of the fan electric motor (M1). The fan electric motor (M1) is arranged in the ventilator (9), and the ventilator (9) is internally provided with a spray ring, that is, the spray ring is disposed inside the ventilator (9). The water pump (14) is connected to a water pump electric motor (M2). A water outlet of the water pump (14) is connected to the spray ring by means of a flexible pipe. The water outlet of the water pump (14) is connected to the water tank (5) by means of a pipeline. The ventilator (9) is located on a base (11). The front portion of the ventilator (9) is hinged to the base (11). The base (11) is rotatably connected to the chassis (6), and the base (11) is connected to a rotary electric motor (12). The rotary electric motor (12) can drive the base (11) to rotate, and the rotary electric motor (12) is disposed on the chassis (6). In this way, the adjustment of the air speed, the direction and the amount of water output is facilitated, the operator control difficulty is reduced, and the dust removal effect is improved.
Answer: C