Abstract: The present invention provides a high-energy-density slurry fuel, a preparation method, and an application. The high-energy-density slurry fuel comprises the following components in percentage by mass: 3%-40% of aluminum-based-metal hydride composite fuel; 53.6%-96% of high-density liquid hydrocarbon fuel; 0.2%-2% of anti-settling agent; and 0.2%-5% of other performance regulators, wherein an aluminum-based-metal hydride is a composite material that disperses and distributes a metal hydride inside aluminum powder particles. The high-energy-density slurry fuel may be used as a fuel for an engine such as a ramjet engine or a rocket engine. Compared with the existing liquid fuel, the present high-energy-density slurry fuel has the characteristics of high density (?20° C.>0.

Abstract: A vacuum suction pen to take reliable hold of objects of different shapes without manual contact includes a holder with an air duct penetrating the holder. A first sleeve is sleeved on one end of the holder, and a first adsorption module is movably arranged on the first sleeve to move along a first direction. The first suction nozzle can move in the horizontal direction, the second nozzle can move in the vertical direction, and the third suction nozzle can rotate around the holder. The positions and relative positions of each suction nozzle on the product to be lifted and manipulated can be adjusted, so as to more accurately locate the center of gravity of products with irregular shapes or of uneven materials, and so as to secure a stable hold on the objects.