转基因技术就是把一个生物体的 ______ 转移到另一个生物体的 _____ 中的生物技术。它是 _____ 的核心。
基因 DNA 现代生物技术
Suppose the CPI basket contains only two kinds of goods (services): gasoline and taxicab service. In the base period, consumers bought 15 gallons of gasoline at $6 and 4 miles of taxicab at $3 each. In the current period, consumers buy 15 gallons of gasoline at $6.2 and 4 miles of taxicab at $2.5 each. The CPI for the current period is closest to:()
A. 99.0.
B. 101.2.
C. 115.3.
混凝土浇筑振捣及完毕,应检查钢筋的位置是否正确及对撞歪的钢筋扶正归位。