问题
单项选择题
Hayem液中NaCl的主要作用是
A．调节细胞渗透压
B．防腐作用
C．防止细胞黏附
D．固定细胞形态
E．提高稀释液比密
答案
参考答案：A
解析：Hayem液中NaCl主要起调节细胞渗透压的作用。
搜题请搜索小程序“爱下问搜题”
Hayem液中NaCl的主要作用是
A．调节细胞渗透压
B．防腐作用
C．防止细胞黏附
D．固定细胞形态
E．提高稀释液比密
参考答案：A
解析：Hayem液中NaCl主要起调节细胞渗透压的作用。
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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