Please select the most similar patent number from A, B, C and D. Which number is?
A two-color heat-shrinkable tube and straight LED light sleeved with the same, the heat-shrinkable tube (3) being divided along a longitudinal direction thereof so as to form two curved segments (31, 32) of different colors when viewed in a cross-section, one segment being a light-transmitting colored curved segment (32) and the other segment being a light-reflecting colored curved segment (31); a central angle (α) corresponding to the light-transmitting colored curved segment (32) is 30-180 degrees. The straight LED light sleeved with the two-color heat-shrinkable tube has an easily recognizable light-emission surface when mounted; the whole light appears more aesthetically pleasing since a back aluminum strip is covered when the light is off; and a shadow at 5-10 mm on both sides of the aluminum strip is eliminated when light is on, thus improving illumination.
A: An LED lamp, comprising: an LED tube and a reflector (21); the LED tube comprises a substrate (22) and LED light strip (23); substrate (22) has an extension structure extending along the LED tube; the extension structure has a cross-section in the shape of a triangle or a V-shaped protrusion; LED light strip (23) is joined to the inclined surfaces of two sides of the protrusion, thus forming two light emitting surfaces; reflector (21) has an extension structure extending along the LED tube; the cross-section of the extension structure is two domes connected side-by-side, the bottom ends thereof having openings; reflector (21) is connected, by means of the connected ends of the domes, to the protrusion of the substrate and the openings of the domes face the light emitting surfaces; each of the light emitting surfaces is located within the enclosure of a dome; the area of the openings of the domes is greater than the area of the light emitting surfaces; each of the light beams of the light emitting surfaces shines toward the corresponding inside wall of a dome, and is reflected via the inside wall of the dome; the part of the light not blocked at the opening of the dome by the light emitting surfaces is emitted. The lamp effectively improves efficiency of light control and prevents glare.
B: Disclosed is an 1E-grade bilayer heat-shrink tube for a nuclear power station, the tube comprising an outer layer and an inner layer, the inner layer being a hot melt adhesive layer and the outer layer being a heat-shrink layer; the outer layer consists of the following components: by weight, 20-40 parts of low density polyethylene, 60-80 parts of an ethylene-methyl acrylate copolymer, 40-60 parts of an ethylene-propylene rubber, 20-40 parts of decabromodiphenylethane, 10-20 parts of antimonous oxide, 8-15 parts of dysprosium oxide, 4-8 parts of a composite antioxidant, and 1-2 parts of a light stabilizer; the inner layer consists of the following components: by weight, 100 parts of an ethylene-methyl acrylate copolymer, 10-30 parts of an ethylene-propylene rubber, 8-15 parts of dysprosium oxide, 4-8 parts of a composite antioxidant and 1-2 parts of a light stabilizer. The 1E-grade bilayer heat-shrink tube for a nuclear power station in the present invention has excellent water-proof and moisture-proof performance, excellent heat resistance, radiation resistance, and high-temperature and high-pressure steam resistance, and the required insulating performance and voltage resistance.
C: A laser tourniquet. A metal tourniquet (1) is installed at the end portion of a laser fiber. The metal tourniquet is installed on the fiber (3) through a fastener (2) or heat-shrinkable tubing. The metal tourniquet comprises a spherical head. The metal spherical head can convert laser energy into thermal energy, and the metal spherical head directly contacts and presses bleeding tissue to achieve a bleeding control function, thereby avoiding disadvantages in earlier laser bleeding control such as a small action area, difficulties in finding the position of an optimal action point and in selecting an action direction of laser accurately, and lack of compressed action on the target tissue. It is proved through many times of test that the tourniquet has a desirable effect in bleeding control and is convenient to use.
D: A heat shrinkable film (11), the heat shrinkable film (11) being used to be heat-shrunk on surfaces of a box body (12), the size of an opening (21) of the heat shrinkable film (11) being larger than the perimeter of the box body (12) in the width and height dimensions (22) by a preset value, and the heat shrinkable film (11) having uniformly distributed vent holes (31). In this technical solution, the heat shrinkable film (11) is, after being heat-shrunk, tightly fitted to the box body (12) and is flat and wrinkle-free.
Answer: A