试题与答案

若某家庭使用功率为2000W,容积为100L的电热水器,加满水后加热,把初温是1

题型:填空题

题目:

若某家庭使用功率为2000W,容积为100L的电热水器,加满水后加热,把初温是10℃的水加热到70℃,这些水需要吸收的热量是      J,若该电热水器的效率为90%,则需要加热的时间为     s。 [水的比热容是4.2×103J/(kg·℃)]

答案:

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Documentation of a software package is normally produced for two purposes.One is toexplain the (71) ofthe software and describe how to use them.This is known as (72) because it is designed to be read by the user of the software.The other purpose ofdocumentation is to describe the software’s internal composition SO that the system can bemaintained later in its life cycle.Documentation of this type is known as (73)

A.system documentation

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