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案例分析题某测量员采用水准仪测定A、B两点间高差，测得A点高程为HA=12.658m，A尺上读数为1526mm，B尺上读数为1182mm。请根据已知条件，回答下列问题。 B点高程HB等于（）。
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某测量员采用水准仪测定A、B两点间高差，测得A点高程为HA=12.658m，A尺上读数为1526mm，B尺上读数为1182mm。 请根据已知条件，回答下列问题。 A、B两点间高差hAB等于( )。
水准测量时，尺子竖立不直，其读数与正确读数相比，有时大、有时小。( )
Although there are many skillful Braille readers, thousands of other blind people find it difficult to learn that system. They are thereby (1) from the world of books and newspapers, having to (2) friends to read aloud to them. A young scientist named Raymond Kurzweil has now designed a computer which is a major (3) in providing aid to the (4) . His machine, Cyclops, has a camera that (5) any page, interprets the print into sounds, and then delivers them orally in a robot-like (6) through a speaker. By pressing the appropriate buttons (7) Cyclops’s keyboard, a blind person can "read" any (8) document in the English language. This remarkable invention represents a tremendous (9) forward in the education of the handicapped. At present, Cyclops costs $50,000. (10) , Mr. Kurzweil and his associates are preparing a smaller (11) improved version that will sell (12) less than half that price. Within a few years, Kurzweil (13) the price range will be low enough for every school and library to (14) one. Michael Hingson, Director of the National Federation for the Blind, hopes that (15) will be able to buy home (16) of Cyclops for the price of a good television set. Mr. Hingson’s organization purchased five machines and is now testing them in Maryland, Colorado, Iowa, California, and New York. Blind people (17) in those tests, making lots of (18) suggestions to the engineers who helped to produce Cyclops. "This is the first time that blind people have ever done individual studies (19) a product was put on the market," Hingson said. "Most manufacturers believed that having the blind help the blind was like telling disabled people to teach other disabled people. In that (20) , the manufacturers have been the blind ones.\
竖轴紧涩转动不灵活可能是竖轴销键过紧或轴套间有污垢所致。( )
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