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【简答题】
光电效应可分为哪三种类型，简单说明其原理并分别列出以之为基础的光电传感器。
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反馈参考答案：
举一反三
【单选题】Success results hard work, and hard work results in success.
A.
from
B.
in
C.
by
D.
with
【单选题】Immigration into the U.S. over the past century has caused the percentage of immigrants in the U.S. population to
A.
fall steadily over the entire century.
B.
rise steadily over the entire century.
C.
fall steadily until the 1970s and increase thereafter.
D.
remain relatively constant over the time period.
E.
rise steadily until the 1970s and fall thereafter.
【简答题】A．The percentage is high. B．The percentage is low. C．The amount of the population is not so low. D．It is not mentioned in the passage.
【单选题】The general formula used for calculating the net national loss from a trade barrier as a percentage of GDP may fail to account for : a. the production effect of the trade barrier . b. the consumption ...
A.
B.
C.
D.
D
【简答题】A．The percentage is high. B．The percentage is low. C．The amount of the population is not so low. D．It is not mentioned in the passage.
【简答题】走一会儿神 be distracted for a moment
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