搜题请搜索小程序“爱下问搜题”
问题 填空题

五十多年前，美国人发明的世界上第一台计算机每秒可以运算5000多次，现在世界上最快的计算器每秒可以运算______万亿次．

答案

五十多年前，美国人发明的世界上第一台计算机每秒可以运算5000多次，现在世界上最快的计算器每秒可以运算 2570万亿次．

故答案为：2570．

选择题

豌豆的种子，黄色对绿色为显性，结黄色种子与结绿色种子的豌豆杂交，子代个体表现类型及比例为黄色种子∶绿色种子=1∶1，子代结黄色种子的个体自交，其后代表现型的比例是[ ]

A．1∶1

B．1∶0

C．3∶1

D．2∶1

查看答案
单项选择题

Diana bought a stereo for $530, which was the retail price plus a 6 percent sales tax. How much money could she have saved if she had bought the stereo at the same retail price in a neighboring state where she would have paid a sales tax of 5 percent ？（）

A．$1.00

B．$2.65

C．$4.30

D．$5.00

E．$5.30
查看答案