After everyone (1)on the playing field (2) noise and excitement of the spectators, our coach again impressed on us the need to do our best (3)excellence.(amid, assemble, in quest of)
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Everything I saw in my hometown (1). I could hardly believe that it (2) such (3) changes through cultivating fruits, vegetables, flowers (4)in the past few years.(and the rest, swift, undergo, marvelous)
1、什么是正态分布?什么是标准正态分布?正态分布曲线有什么特点?
生物工程的发展史分为哪几个阶段？
A. 古代生物工程阶段
B. 近代生物工程阶段
C. 现代生物工程阶段
D. 当代生物工程阶段
古代生物工程发展阶段的生产特点是：
A. 设备要求不高
B. 规模不大
C. 过程较简单
D. 属嫌气发酵
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