单项选择题

Industrial products are often the result of ______ according to the passage.

A．laboratory work
B．market survey
C．commercial research
D．business growth
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单项选择题
The main difference between consumer markets and industrial ones is ______.
A．consumer markets focus on research while industrial ones focus on developing
B．consumer markets focus on tailors while industrial ones focus on medicine
C．consumer markets focus on specific while industrial ones focus on general
D．consumer markets focus on application while industrial ones focus on plan
单项选择题
How long does it take for some industries acquiring commercial potential
A．From five to ten years.
B．From six to eight years.
C．From seven to eleven years.
D．From eleven to eighteen years.
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