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【简答题】
对He-Ne激光器输出的632.8nm的红光来说，其中心频率是4.7×10 14 Hz，频率宽度△γ=1.5×10 9 Hz。问Ne所发出的波长范围为多大?由此，你对一般情况下所说的单色光作何理解?
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举一反三
【多选题】What's the problem of the tire of Miss Ling?
A.
the tire is break
B.
The tire has a crack.
C.
the air pressure of tire is too low.
D.
The tire wear badly.
【简答题】The applicant for the patent of pneumatic tire is ______.
【单选题】Lily’s mother looked for her for half an hour, but could not find ________? what Lily was B. what was Lily C. where Lily was D. where was Lily
A.
what Lily was
B.
what was Lily
C.
where Lily was
D.
where was Lily
【简答题】看图对话。 Tom Lily Tom: Hello. Lily: ____________! Tom: Lily, today is my birthday! Lily: ____________! Lily: ____________? Tom: I am six.
【简答题】A．She saw a nail in the man's tire. B．The man shouldn't drive on the tire. C．The man may not need a new tire. D．She also needs air in her tires.
【单选题】A certain tire company can produce tires at a cost of $22,500 per batch plus $9 per tire. The company can sell tires to the wholesaler at a cost of $20 per tire. If a batch of 15,000 tires is produced...
A.
$9.00
B.
$9.50
C.
$11.00
D.
$13.50
E.
$20.00
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