题目内容
焊件实际吸收到的热量要少于焊接热源所提供的热量。( )
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7.先进的焊接技术要求热源能够进行高速焊接,并能获得致密的焊缝和最小的加热范围。( )
在常用焊接方法中,气焊的加热面积最小,激光焊的最大功率密度最大。( )
焊条电弧焊的热效率高于埋弧焊。( )
Read the text Home Entertainment in the USA, and fill in the blanks in no more than three words in each blank.Leisure activities in the USA:Different age groups spend reading, playing video games or using a computer for leisure:4. People aged 75 and over read about ___ per weekend day, play video games and use a computer for about ____.5. People aged 15 to 19 read for an average of only ____ per weekend day, but spend _____ playing video games or using a computer.6. Now more and more older people are ___________ and visiting ____________ like Facebook and MySpace that was something almost only young people did.
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