Because of the vacuum,the boiling point of the liquid is lower thaa it would be under_____ (59)atmospheric pressure.This effect is known from the mountains:as the atmospheric pressure there is lower than in the valley,water boils at temperatures distinctly below 100~C.The evaporated, non-saline water is condensed and runs down through a completely filled tube in a controlled manner.The gravity of this water column_________(60)produces the vacuum and so a vacuum pump is not needed.The reconcentrated brine________(61)down the tower surface again to absorb moisture from the air.
The concept is suitable for various water_________(62).Single-person units and plants supplying water to entire hotels are conceivable,says Egner.Prototypes have been built for______
(63)system components-air moisture absorption and vacuum evaporation-and the research scientistshave Mready________(64)their interplay on a laboratory scale.In a further________(65)the researchers intend to develop a demonstration facility.
51.A.road B.channel C.way D.path
52.A.in spite of B.because of C.as a result of D.such as
53.A.who B.where C.when D.which
54.A.meanwhile B.therefore C.however D.still
55.A.prospect B.process C.progress D.product
56.A.from B.at C.above D.into
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