单项选择题

According to the passage, a designer of products is preoccupied with the following problems EXCEPT ______.

A．customer appeal
B．man-hour
C．machine to tolerance
D．stress factors
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单项选择题
Advertisers are appreciated by manufacturers because they ______.
A．advise them on ways of giving a product customer appeal
B．accept responsibility for giving a product customer appeal
C．advise them on the best time to go ahead with production
D．consult them during the design and development stages
单项选择题
The forms of advertising mentioned in paragraph 1 would have least impact ______.
A．in the rush hours
B．during working hours
C．before working hours
D．after working hours
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