问题
单项选择题 A1/A2型题
下列哪项不是支架变形的原因（）
A.支架熔模变形
B.包埋材料的热膨胀率不足
C.打磨引起变形
D.合金的线收缩率过大
E.铸造合金量不足
答案
参考答案：E
搜题请搜索小程序“爱下问搜题”
下列哪项不是支架变形的原因（）
A.支架熔模变形
B.包埋材料的热膨胀率不足
C.打磨引起变形
D.合金的线收缩率过大
E.铸造合金量不足
参考答案：E
Every scientist has a childhood dream. A scientist in China once had a(n) 36 . He wished to grow a new type of rice which could produce a lot. This person is Yuan Longping 37 was born in 1930. He graduated from the Southwest Agricultural(农业) University in 1953. Yuan Longping came up with an idea for a hybrid rice in the 1960s. Since then, he has devoted himself to the research and development of new varieties(品种). In 1973, together with other people, he 38 in the development of hybrid rice. This made China be a worldwide leader in rice production. For this, he was called Father of Hybrid Rice. In 1980, the technology for hybrid rice was 39 to the United States. 40 Professor Yuan’s hard work, China now produces enough rice to 41 her people every year. In his spare time, he loves playing 42 violin and listening to music. Every night, he reads 43 half an hour before he goes to sleep. He likes swimming, too. It is said that Professor Yuan is one of the 44 people in China. And he cares about 45 but his research. Now Professor Yuan is working on developing super hybrid rice. He goes to the fields twice a day.
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