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【简答题】
分别用波长 1 =500 nm与波长 2 =600 nm的平行单色光垂直照射到劈形膜上,劈形膜的折射率为3.1 ,膜两侧是同样的媒质,则这两种波长的光分别形成的第七条明纹所对应的膜的厚度之差为__________nm.(填3位数字)
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举一反三
【单选题】There are many ways to express our feelings of loneliness, such as writing diaries, writing imaginary letter, drawing a picture and so on.
A.
Y
B.
N
C.
NG
【单选题】The policeman came up to see_____.
A.
what the matter is
B.
what the matter was
C.
what was the matter
D.
what is the matter
【简答题】蜜蜂或其它昆虫在花丛中飞舞、爬行时,就会把雄蕊的花粉传播到 的柱头上,这会使雌蕊子房里的 受精后发育成长形成 。
【单选题】What was he doing ______ his father _______ back?
A.
while; came
B.
when; came
C.
when; was coming
【简答题】A．Reading in the afternoon. B．Reading in the morning. C．Reading in the evening. D．Doing morning reading right after getting up.
【单选题】______, tears came to her eyes.
A.
Reading the letter
B.
While reading the letter
C.
As she was reading the letter
D.
To read the letter
【简答题】What did children come to her for? Children came to her for ______.
【单选题】The shop owner came up to see______.
A.
what was happened
B.
what was going on
C.
what the matter was
D.
what is the matter
【简答题】What was Dr．Eric before he came to India?
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