单项选择题

Lens designers today______.

A．have a large source of help to fall back on
B．receive a low salary
C．are less respectable than those of the past
D．are not decisive in the lens design

<上一题目录下一题>

热门试题

单项选择题

The final goal of designing a lens is______.

A．to trap the opponent's lenses
B．to focus light with lenses
C．to hand-make lenses at low cost
D．to reflect light by means of curved surfaces

单项选择题

Which of the following words cannot be used to describe today's lensesA. More delicate.C. Numerous.B. Cheaper.D. Unpopular.

A．Cheaper.
B．Unpopular.
C．Numerous.
D．Which of the following words cannot be used to describe today's lenses
E．More delicate.