关于先天性肾盂输尿管交界处梗阻的原因，下列哪项是错误的（）

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问题单项选择题 A1型题

A.先天性狭窄

B.异位血管压迫

C.纤维束压迫

D.动力性梗阻

E.输尿管息肉梗阻

答案

参考答案：E

单项选择题

( )是材料抵抗弯曲断裂能力的标志，它间接反映了材料的塑性。

A．断裂韧性

B．冷弯性能

C．硬度

D．冲击韧性

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单项选择题

"I would almost rather see you dead." Robert 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 ranked among the best of Philadelphia’s social families, such an idea could not even be considered.
That was how Mary Cassatt, born in 1844, began her straggle as an artist. She did not tremble before her father’s anger. Instead; she opposed him with courage and at last made him change his mind. Mary Cassatt gave up her social position and all thought of a husband 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 made Mary Cassatt’s "struggle" to become a recognized artist especially hard
[A] She was a woman.
[B] Her father opposed her.
[C] She had no social position.

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