问题
单项选择题
Which of the following city is located in Europe？（）
A．Bangkok
B．Chicago
C．New York
D．Oslo
答案
参考答案：D
搜题请搜索小程序“爱下问搜题”
Which of the following city is located in Europe？（）
A．Bangkok
B．Chicago
C．New York
D．Oslo
参考答案：D
，为使A的转化率达到最大，应采取的措施是（）。