Прочитайте текст A delicate heart operation was performed in a hermetically sealed high-pressure cha...: ответ на тест 605375 - Английский язык

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A delicate heart operation was performed in a hermetically sealed high-pressure chamber at the Moscow Research Institute for Clinical and Experimental Surgery.
The operated man was 48-years old. He had been hardly able to move because he was suffering from a serious congenital valve defect.
Now this operation is considered not a very complex one. But in this patient there was a serious risk of blood clotting in the brain.
The risk became quite insignificant when the operation was performed in the high-pressure chamber. At normal air pressure the amount of oxygen in a patient’s blood remains unchanged even if he breathes in pure oxygen. In a pressure chamber the oxygen amount in the blood increases considerably. In a pressure chamber the surgeon is able to operate with greater freedom on vital organs such as the brain, heart or blood vessels.
But it is very hard to work under high pressure. When operations are performed at seven or eight atmosphere pressures, the operation can only last two and a half hours. The personnel in the chamber have to be changed.
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In a pressure chamber the oxygen amount _______.

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A stroke
1. A stroke, or cerebrovascular accident (CVA), is the rapid loss of brain function due to disturbance in the blood supply to the brain. This can be due to ischemia caused by blockage (thrombosis, arterial embolism), or a hemorrhage. As a result, the affected area of the brain cannot function, which might result in an inability to move one or more limbs on one side of the body, inability to understand or formulate speech, or an inability to see one side of the visual field.
2. A stroke is a medical emergency and can cause permanent neurological damage and death. Risk factors for stroke include old age, high blood pressure, previous stroke or transient ischemic attack (TIA), diabetes, high cholesterol, tobacco smoking and atrial fibrillation. High blood pressure is the most important modifiable risk factor of stroke. It is the second leading cause of death worldwide.
3. An ischemic stroke is occasionally treated in a hospital with thrombolysis (also known as a «clot buster»), and some hemorrhagic strokes benefit from neurosurgery. Treatment to recover any lost function is termed stroke rehabilitation, ideally in a stroke unit and involving health professions such as speech and language therapy, physical therapy and occupational therapy.
4. Prevention of recurrence may involve the administration of antiplatelet drugs such as aspirin and dipyridamole, control and reduction of high blood pressure, and the use of statins. Selected patients may benefit from carotid endarterectomy and the use of anticoagulants.
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Power dividers serve a multitude of circuit and system applications, from amplifiers to radar receivers. The power divider is housed in a hermetic enclosure with stainless-steel female SMA connectors. As these stripline power dividers feature such small physical dimensions, more than 20 power dividers can be fabricated from a single substrate. Unit-to-unit amplitude tracking is specified as better than ±0.6 dB, while standard unit-to-unit phase tracking is better than ±6 deg. at 18 GHz.
Insertion loss (in excess of expected power-division losses) is less than 2.0 dB.
The four-way power divider boasts amplitude balance of better than ±0.4 dB. Phase balance is better than ±5 deg. Designed to handle input power levels to 1 W CW, the power divider supports wide-dynamic-range signal processing.
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The four-way power divider boasts amplitude balance _________________.

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For use in broadcast and communications satellite receivers, the series of microwave local oscillators feature the smallest, lightest designs in the industry, weighting 4.4 g and measuring 7.5 mm tall. They offer a 1.9 cc volume. There are six models; samples are available. This one operates at 10.678 GHz. The 2nd covers 11.200 GHz, the 3rd works at 11.300 GHz and the 7th accommodates 10.750 GHz. The 8th works at 10.873 GHz, the 9th handles 10.990 GHz. The excellent performance eliminates the need to adjust the high frequency. As a whole, the modules make it possible to create a miniature outdoor unit for satellite broadcasting. They are suitable for converters in flat antennas, and mount easily on converters.
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The excellent performance eliminates the need to adjust ________________.

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A compact noise filter for large equipment accommodates currents as large as 100 A or more because it incorporates flat, vertically wound copper wire. Samples will be available in October. To wind the straight copper wire, the engineers used an automatic winder, creating double coils adjacent to each other. This raises the density of the electromagnetic coupling and results in 5-to-10-fold improvements in the current super-position characteristics of inductance. For easy assembly, the coil combines with UU or UI ferrite cores. Offering voltage rating for AC 250 V single-phrase or AC 450 V triple-phase, the filters attain a current rating of 50 to 150 A. The 80 A version measures 150 €240 €90 mm.
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For easy assembly, the coil combines with __________________.

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Matsushita “T-Series” relays, for 30 W or 60 W nominal loads, meet the stringent demands of modern control, supervision, monitoring an test applications in the telecommunication, security, computer, medical, home appliance and automotive industries.
The ultra-small relay is capable of switching up to 30 W loads at 1 A max, 125 V max on each of its 2 or 4 changeover contracts. The relay, with greater coil sensitivity, is suitable for either through-hole applications or surface mounting.
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The relay, with greater coil sensitivity, is suitable for either through-hole applications or ___________________.