Western Rhododendron breeding methods: Cutting propagation: It is usually carried out from May to June. Choose semi-mature twigs as well, inserts 12 to 15 cm long, remove 2 to 3 leaves at the base, leave the top leaves and cut in half, and insert them into the insertion bed of humus or river ......
1. Fine- cultivation of autumn garlic is suitable for sandy soil with deep, fertile, loose and well-drained soil. Tillage depth of 15 to 20 cm, with deep manure Mushi base fertilizer 1000 to 1500 kg, about 2 meters wide and made furrow, dug drains, Qimian remain flat, osteoporosis. Second, timely ......
According to the principle of thermal expansion and contraction, after the bolt is cooled, the nut will be pressed tightly. Traditionally, the "carbon silicon tube bolt heater" has been used. This heater has the following drawbacks: First, the resistance values ​​are inco ......
The applied stress thermal cycle test of the memory alloy spring was carried out on a self-made thermal cycle tester. The applied external force is O. 7N and 1. ON, the upper and lower limits of the thermal cycle are 10 ° C and 15 ° C, respectively, at the upper and lower limit temperature ......
1. Steel mesh cement sandwich composite board It is made of two pieces of steel mesh, such as polyurethane, polystyrene, urea-formaldehyde resin and other foam materials, light rock wool or glass wool sandwiched in the middle, and the two wires are diagonally passed through the core. The wire ......
[China Aluminum Industry Network] Aluminum products widely used in daily life have once been more expensive than gold. Aluminum from the royal family of two hundred years ago? Nuo Tongmei irritated and punished? Two 裉烊谌胙俺 0 å‚© accounted for far away? æ• æ¸Ž ......
1, thermal resistance Rth The ratio of the temperature difference on the heat flow channel to the power dissipated on the channel; when the LED is illuminated to reach the heat conduction steady state, the chip surface dissipates 1 W of power, the temperature of the chip pn junction and the c ......
(1) The problem of strong softness of sand belts usually occurs on the belt of animal glue. Especially in the rainy season, animal glue tends to become soft and sticky due to moisture absorption. Therefore, in the rainy season, where there is more or more moisture, Half-resin or full-resin adhesives ......
According to a report recently organized by the Physicist Organization Network, scientists at the Brookhaven National Laboratory of the US Department of Energy have developed a DNA "connector" that can link nanorods together like a rope, forming a k ......
The high-tower compound fertilizer has a high urea content, and also contains a certain amount of phosphate fertilizer and potassium chloride fertilizer, and has good water solubility. Although this should not be done after the application, it should be applied by ditching, applying soil after appl ......