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更多“计算940×【128-（25+175）÷100】时，第二步算…”相关的问题
第7题
“安全作业标”设置要求（）
A.“安全作业标”设在装卸线、机车整备线、给水线等分段绝缘器内侧2m处
B.距线路中心3.5m(机车整备线以不侵限为原则)
C.面向无电区侧而立。标志牌白底、黑字、黑框，尺寸为940×220mm
D.距地面高度1.5m(包括标志牌)
第8题
某燃烧炉的平壁由下列三种砖依次彻成耐火砖：热导率=1.05W/（m2·℃）；厚度b1=0.23m；绝热砖：热导率=0.151W/（m2·℃）每块厚度b2=0.23m；普通砖：热导率=0.93W/（m2·℃）每块厚度b3=0.24m；若已知耐火砖内侧温度为1000℃，耐火砖与绝热砖接触处温度为940℃，而绝热砖与普通砖接触处的温度不得超过138℃，试问：（1）绝热层需几块绝热砖？（2）此时普通砖外侧温度为多少？
第9题
根据以下内容回答题：In the mid 1 940’s，the young ambitious duo（艺人）Ruth and Elliot Handler
，owned a Company that made wooden pictures frames．It was in l945 that Ruth and Elliot Handler joined with their close friend Harold Mattson to form. a company that would be known for the most fa-mous and successful doll（洋娃娃）ever created．This company would be named Mattel，Matt for Mattson，and EL for Elliot． In the mid 1950’s，while visiting Switzerland，Ruth Handler purchased a German Lilli doll．Lilli was a shapely，pretty fashion doll first made in l955．She was originally fashioned after a famous cartoon character in the West German Newsletter-Build． Lilli is the doll that would inspire Ruth Handler to design the Barbie doll（芭比娃娃）．With the help of her technicians and engineers at Mattel，Barbie was born．Ruth then hired Charlotte Johnson，a fashion designer，to create Barbie’S wardrobe．It was in l958 that the patent for Barbie was obtained．This would be a fashion doll unlike any of her time．She would be long 1imbed，shapely，beautiful，and only 11．5 inches tall．Ruth and Elliot would name their new fashion doll after their own daughter，Barbie． In 1959，the Barbie doll would make her way to the New York Toy Show and receive a cool reception from the toy buyers． Barbie has undergone a lot of changes over the years and has managed to keep up with current trends in hairstyles，make-up and clothin9．She is a reflection of the history of fashion since her introduction to the tov market． Barbie has a universal appeal and collectors both young and old enjoy time spent and memories made with their dolls．
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When Ruth and Elliot Handler was youn9，they had a strong desire__________ ．
A.to go to school．
B.to take photos．
C.to make frames．
D.to be highly successful．
