Please select the most similar patent number from A, B, C and D. Which number is?
A handheld multifunctional machine, comprising a swing mechanism (10) and a motor and further comprising a reduction gearbox (20). One end of the reduction gearbox (20) is connected to the motor, the other end of the reduction gearbox (20) is connected to the swing mechanism (10), and the reduction gearbox (20) drives the swing mechanism (10) to operate. By adding the reduction gearbox (20) on a swing machine, the transmission ratio of a swing machine is improved, working efficiency is increased, and the processing of relatively deep holes and relatively hard materials may be achieved.
A: Provided is a turbine fracturing apparatus, comprising a transporting device (2), a turbine engine (5), a reduction gearbox (6), a transmission mechanism (7) and a fracturing pump (8), the output end of the turbine engine (5) is connected with one end of the reduction gearbox (6), the other end of the reduction gearbox (6) is in transmission connected with the fracturing pump (8) through the transmission mechanism (7), the transportation device (2) is used for bearing the turbine engine (5), the reduction gearbox (6), the transmission mechanism (7) and the fracturing pump (8), the transportation device (2) comprises a chassis, the chassis is provided with a transporting section, a bearing section and a lapping section which are connected in sequence, when the turbine fracturing apparatus is in a working state, the bearing section can be contacted with the ground, when the turbine fracturing apparatus is in a transporting state, the bearing section does not make contact with the ground.
B: Disclosed is a turbine fracturing semitrailer, comprising a semitrailer body (3), a turbine engine (7), a reduction gearbox (8), a transmission mechanism and a plunger pump (10), wherein the turbine engine (7), the reduction gearbox (8), the transmission mechanism and the plunger pump (10) are arranged on the semitrailer body (3); an output end of the turbine engine (7) is connected to the reduction gearbox (8); and the reduction gearbox (8) is in transmission connection with the plunger pump (10) by means of the transmission mechanism. By means of linear connection of the turbine engine (7), the reduction gearbox (8), the transmission mechanism and the plunger pump (10) in a power transmission direction, excessive transmission loss can be prevented, thereby ensuring efficient transmission performance.
C: Disclosed is a semitrailer-mounted turbine fracturing apparatus, comprising a transportation device (200), an exhaust system, a turbine engine (500) and a plunger pump (600). The exhaust system is connected to an exhaust port of the turbine engine (500), an output end of the turbine engine (500) is directly connected to the plunger pump (600), and the transportation device (200) is used for bearing the exhaust system, the turbine engine (500) and the plunger pump (600). The plunger pump (600) comprises a power end assembly (1), a fluid end assembly (2) and a reduction gearbox assembly (3), wherein one end of the power end assembly (1) is connected to the fluid end assembly (2), and the other end of the power end assembly (1) is connected to the reduction gearbox assembly (3); and the reduction gearbox assembly (3) comprises a planetary reduction gearbox and a parallel reduction gearbox (10), and the planetary reduction gearbox and the parallel reduction gearbox (10) are used in cooperation, wherein the transmission ratio is 60:1 - 106:1.
D: An oscillating power tool (1), comprising: a switch starting up and shutting down a motor (23); a trigger piece (25) used for triggering the switch; a transmission mechanism; an adjustment mechanism (6) used for enabling the oscillating power tool (1) to have different oscillation angles. The oscillating power tool (1) also comprises a stopper mechanism movably arranged with respect to a housing (2), the stopper mechanism having two positions. When the switch starts up the motor (23), the stopper mechanism is located in a first position, and prevents the adjustment mechanism (6) from adjusting the transmission mechanism. When the adjustment mechanism (6) adjusts the transmission mechanism, the stopper mechanism is located in a second position, and prevents the switch from starting up the motor (23). A user is not able to adjust the oscillation angle when the oscillating power tool (1) is turned on. During adjustment of the oscillation angle by the adjustment mechanism (6), i.e. when the adjustment mechanism (6) is not adjusted in place, the user is not able to turn on the oscillating power tool (1). The present technical solution increases the reliability of the oscillating power tool (1), and improves operational safety.
Answer: D