Please select the most similar patent number from A, B, C and D. Which number is?
A tunnel smooth blasting uncoupled shaped charge device and a charge method. Said device comprises a C-type shaped pipe, shaped hollow columns are symmetrically provided within the C-type shaped pipe, the cross section of each shaped hollow column is a conical structure, a top end of the shaped hollow column is a shaped embedded end, and the shaped included angle of the shaped embedded end is 30-70 degrees. Compared with the prior art, the tunnel smooth blasting uncoupled shaped charge device and the charge method have a novel structure, strong practicability and a strong combination type, and can select an uncoupled strip with an appropriate length according to the depth of a blast hole, having high adaptability. Before construction, the required charge column, C-type shaped pipe and uncoupled strip are respectively transported to a tunnel face for on-site assembly, the assembly method is simple and time and labor saving, facilitating the management of explosives.
A: The present invention relates to a solar energy gathering device and a method for determining an inclination angle of a mounting slope of a mounting base assembly of the solar energy gathering device. The solar energy gathering device comprises a mounting support, an energy gathering structure, an east-west angle rotating structure, a pitch angle rotating structure, a mounting base assembly, and a reflector. The energy gathering structure is mounted on the mounting support; the mounting support is respectively connected to the east-west angle rotating structure and the pitch angle rotating structure; the mounting base assembly is mounted on the mounting support, an end portion of each mounting base assembly is provided with a mounting slope, and the mounting slope is perpendicular to a normal between direct light of the sun and reflected light of the energy gathering structure; the reflector is mounted on the mounting slope, and angles of a reflective surface of the reflector and the mounting slope are the same so that the reflector can reflect sunlight to the energy gathering device. The solar energy gathering device has the advantages that an energy gathering effect is good, a reflection angle of the reflector can be adjusted and controlled according to different irradiation angles of the sun, the process is simple, and batch manufacturing can be achieved, etc..
B: A solar energy distillation apparatus, comprising vaporization energy collecting shades (1), steam guide pipes (2) and a distillate receiving container (3); the vaporization energy collecting shades (1) comprise a curved light reflecting cup (4) and a vaporization pipe column (5), a lower end of the vaporization pipe column (5) communicating with a through hole (9) at a bottom portion of the curved light reflecting cup (4), while an upper end of the vaporization pipe column (5) communicates with the distillate receiving container (3) by means of the steam guide pipe (2); an inner surface of the curved light reflecting cup (4) is a solar light reflecting surface, the solar light reflecting surface focusing solar light onto the vaporization pipe column (5), and the vaporization pipe column (5) being communicatively provided thereon with a vaporization ball (6); the bottom portion of the curved light reflecting cup (4) is provided with a water discharge hole (12), the water discharge hole (12) being connected to a water discharge pipe (13); a floating body (7) is provided on the edge of the curved light reflecting cup (4), and the bottom portion of the curved light reflecting cup (4) is connectedly provided with a counterweight (8). The apparatus may obtain drinkable desalted water by using solar energy to evaporate seawater; the apparatus has a simple structure, is low-cost, saves energy, is environmentally friendly and is convenient to use.
C: Disclosed is a longwall working face, non-pillared mining method, comprising the following steps: 1. Excavating a headentry (2) and a tailentry (3); 2. Reinforcing a top panel (5) of the headentry (3) and drilling on the top panel an energy collecting hole (7) for pre-splitting blasting; 3. Extracting until a goaf is formed; 4. Blasting at a position corresponding to the energy collecting hole and forming a kerf on the top panel; 5. The mining face collapsing to become a new tunnel; 6. Taking the original tailentry as the headentry of the next mining face, and excavating a tailentry relative to the headentry, to form a new mining face; and 7. Repeating steps 2-6, and continuing to mine coal until the coal seam mining is completed. The present method involves continuity between every two mining faces, non-pillared support, a short process for forming roadways, and high efficiency of mining and forming roadways.
D: A medium-length hole large cross-section composite cut blasting structure and method. A large-diameter hole (1) perpendicular to a working face is disposed at a position near but lower than a center of a tunneling working face. Several cut holes (2) are disposed around the large-diameter hole (1). The cut holes (2) are distributed in a spiral pattern with a central axis of the large-diameter hole (1) as a center. The lengths of the cut holes (2) increase gradually from the center of the spiral pattern to outside. The cut holes (2) are inclined holes with the inner end inclined toward the central axis of the large-diameter hole (1). Several peripheral holes (4) and several floor holes (5) are disposed along an outer contour of the working face on the tunneling working face for controlling the contour of the working face after the blasting. Two rows of auxiliary holes (3) are disposed between the peripheral holes (4) and the cut holes (2), and one row of auxiliary holes (3) is disposed between the cut holes (2) and the floor holes (5). The cut holes (2), the auxiliary holes (3), the peripheral holes (4) and the floor holes (5) are all provided with water bags, explosives and detonators therein. The configuration of the present invention reduces the vibration velocity of blasting, the charge volume for blasting and the amount of labor, and also causes less damage to surrounding rocks.
Answer: D