计算题:有一铜管拉伸前的长度是50mm,拉断后的长度为55.8mm,试求其延伸率是多少?
参考答案:
"I would almost rather see you dead. " Bobert S. Cassatt, a leading banker of Philadelphia, shouted when his twenty-year-old eldest daughter announced that she wanted to become an artist. In the 19th century, playing at drawing or painting on dishes was all right for a young lady, but serious work in art was not. And when the young lady’ s family racked among the best of Philadelphia’s social families, such an idea could not even be considered. That was how Mary Cassatt, born 1844, began her struggle as an artist. She did not tremble before her father’s anger, she opposed him with courage and at last made him change his mind. Mary Cassatt gave up her social position and all thoughts of a thousand and a family, which in those times was unthinkable for a young lady. In the end, after long years of hard work and perseverance, she became America’s most important woman artist and the internationally recognized leading woman painter of the time.
What in fact was Mr Cassatt’ s main reason in opposing his daughter’ s wish
A. Drawing and painting was simply unthinkable among ladies in those days.B. He did not believe his daughter wanted to work seriously in art.C. He believed an artist’ s life would be too hard for his daughter.D. Ladies of good families simply did not become artists in those times.
监理工程师对勘察、设计单位资质审核的重点不包括( )。
A.企业资质的近期变动
B.营业执照的有效性
C.注册证书的有效性
D.资质证书的有效性