描述性调查即为了界定调研者所需要理解的具体某项市场调查的本质及调查对象各种变量的关系而进行的市场调查。()
A、正确
B、错误

数字42000，若有3个无效零，则为两位有效位数，应写为（ ）。A.4.2×10B.42×103C.420×1...

单项选择题数字42000，若有3个无效零，则为两位有效位数，应写为（ ）。

According to the dietary therapy of TCM, if you have a ...

判断题According to the dietary therapy of TCM, if you have a fever, drinking ginger tea can always cure you.

The main body of Chinese farming civilization includes ...

单项选择题The main body of Chinese farming civilization includes national management concept, folk songs, _____ and various sacrificial activities.（ ）