单项选择题

Compared with a chess player, lens designer______.

A．can put his design to mass production
B．can draw on various sources in his work
C．can reduce the cost of lens production
D．has no one to train him before taking up the work

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热门试题

单项选择题

In lens design,______.

A．it is completely impossible to preset the best steps along the way
B．it is always very hard to solve any problems
C．one can work out a best solution to problems in each step
D．there are countless steps towards the final goal

单项选择题

A lens designer in the past______.

A．did their work better
B．did not use glass for making lenses
C．was usually poor
D．designed the lens all by himself