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1. Chemical Engineering English Translation
Annealing at 800? Under a nitrogen atmosphere, a yellow colored powder is obtained as an intermediate product of BNO, which may have the following formula B4N3O2H [11a]. The yellow powder was further calibrated in air at 600 ° C for 2 hours to obtain more oxygen in the white BNO product. The prepared British National (Overseas) precursor is put into a large graphite crucible. Aluminum chloride is placed in a small BN crucible above the crucible. These components are enclosed in graphite suspension receptors and heated in an induction furnace. Then evacuate the furnace and introduce a pure Ar gas stream. Heating the furnace step by step. When the gas flow rate at a temperature of about 950 ℃ C is switched to: pure NH3/N2 (N2 100 mL/min ± 1, ammonia nitrogen 200 mL/min ± 1). Afterwards, raise the temperature and maintain it at 1200 C for approximately 1.2 hours. Then increase the temperature further. Adjustment of position sensor for British National (Overseas) precursor in large graphite crucible to ensure heating of BNO precursor mixture at C. 1600? The atmosphere is that the flow of N2/NH3 has the same velocity, as in the first stage. After about an hour of coaxial tubular single crystalline cubic aluminum nitride nanotubes and a BN coating. The X-ray diffractometer (2200HF RINT) and high-resolution transmission field emission electron microscope (HRTEM) (JEM-3000F) on this product are connected to an X-ray energy dispersive spectrometer (EDS).
2. Barrel pump
3. The meaning of gas
gas [ɡæ s] n. gas; Mining gas; Gasoline; Poison gas, come on; Poison (death) vi. Keep going; Release gas; Empty talk [plural gas past tense gas past participle gas p
4. Two English materials
Clearly explain the types of pollution and their impacts. This is the first of the four benefits of trees. 1. Trees can regulate the climate and maintain ecological balance Trees absorb carbon dioxide and exhale oxygen through photosynthesis, making the air clean and fresh One acre of forest releases enough oxygen for 65 people to breathe 2. Trees can prevent wind and sand, conserve soil and water, and absorb various types of dust. One acre of forest can absorb 20-60 tons of various types of dust per year 3. Forests can reduce noise pollution. A 40 meter wide forest belt can reduce noise by 10-15 decibels 4. The secretions of trees can kill bacteria There are 3-4 thousand bacteria per cubic meter of air in open spaces, while in forests there are only 3-4 hundred Planting trees and afforestation is the obligation of every citizen, and the country has specifically designated March 12th as Arbor Day. Planting trees and afforestation have great benefits for our learning, work, life, and other aspects. Planting trees and afforestation can purify the air, beautify the environment, and green the motherland. It can also produce oxygen for people to absorb and inhale the carbon dioxide e