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In the '80s and' 90s, the district hospital had no beeper and had to let family members run errands. "Nurse, there's no potion in the six, seven or eight beds in our room. Please go and change them quickly." A patient's family came to the nurse's office to yell.
Spacecraft flew hundreds of thousands to hundreds of millions of kilometers from the earth, injecting speed when the size and direction of a slight error, arrived at target planets will appear large deviation error, for example, when Mars probe injecting speed 1 m/s speed (about one over ten thousand), arrived at Mars, about 100000 km distance deviation. Therefore, precise control and navigation must be carried out during the long flight. Flying to the moon is usually controlled by the orbital control system of the ground and space probe (see orbit control). Interplanetary flight distances, radio signal transmission time is long, the real-time remote control, can't so planets and interplanetary spacecraft orbit control system shall have the ability of autonomous navigation (see interstellar travel navigation and control). The United States, for example, "pirates" spacecraft in space flight of more than eight hundred million km, for 11 months of 2000 times of autonomous orbit adjustment, the final surface to achieve a soft landing on Mars, placement accuracy up to 50 km. In addition, in order to ensure the accuracy of the orbit control engine, the communication antenna is always aimed at the earth, and other systems work normally, and the detector has the autonomous attitude control ability
The function of the surface balance: the machine is better than the detection of metal objects and not interference.
Some algae species are 50% or more lipid oil by weight. This oil may be pressed from the algae and refined into diesel. The process for extracting algal oil, at its simplest level, resembles pressing an olive. Up to 75% from the oil might be squeezed from algae using a simple mechanical press. Hexane might be used being a solvent to raise extraction up to 95%. Once extracted, the oil is refined through transesterification. A catalyst including sodium hydroxide is combined with alcohol to make biodiesel and glycerol.
Price means the rate at which the merchandise can be bought. A number of factors get excited about determining the price of a product. These include competition, market share, product identity, material costs along with the value customers perceive of a product. In fact cost is also dependant on competitor's products. If the competitors have the same product, then the buying price of something will go down.
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