The influence of the oxygen balance of pyrotechnical combustion agent and the structure of its rare earth metal shell on the burning performance of the combined combustion element were studied.
Whenever life gets to be too much for the little crab, he pulls his shell over his head and withdraws from the world to enjoy peace and to regain his balance and a sense of security.
无论何时，一旦蟹生太沉重，小螃蟹就会把壳拽下来，从这个世界退回去，享受宁静，重新得到平衡和安全感。
3
This utility model is characterized in that: seal rings are set in the spool and shell of the aforesaid balance valve.