A water rocket automatically opening the parachute, including a rocket head, a storage bin, a power bin, a tail wing, a parachute, a tether 1, and a tether 2.

Aiming at the fracture problem of the square plansifter with 8 cells, the calculation for nature frequency and dynamic response of this structure is completed.

LuHong high pressure boiler tube website information reported: yesterday rebar sharply peatlands ing uplink, hit a record high, the biggest motivation still from cost boost.