Barracuda seed cultivation techniques

Barracuda, also known as meat sticks, red-eye fish, its salt, a wide range of temperature, sea water, brackish water or pure water can survive, is omnivorous fish based on plant food. Its optimum growth temperature range is 1 °C ~ 30 °C, and the optimum temperature is 12 °C ~ 25 °C.......

Gum culture

1. Condition of the rearing pond: The shape and structure of the pond is basically the same, but the area is larger and deeper. The general specifications are 30-40 square meters, the depth of the pond is 70-80cm, the bottom type of the bottom of the pool, and the bottom of the sewage outlet i.......

The reason why hot cars don't work well

Engine heat engine is not as good as the cold start, the reasons: 1, the piston ring edge clearance is too small, the heat engine when swelled in the piston ring groove, loses elasticity, the cylinder is not sealed. 2. The clearance between the valve and valve duct is too small. After heating,.......