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【单选题】
The passage is developed primarily by ______.A.
testing the evidence supporting a theory
B.
describing causes and effects of events
C.
weighing the pros and cons of a plan
D.
projecting the future consequences of a decision
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【简答题】You may have known several kinds of police, traffic police, and street police. But have you ever heard of energy-saving (节能) policemen? A group of 22 of these new policemen went to work last week in B...
【简答题】You may have known several kinds of police --- traffic police, fire police and street police. But have you ever heard of energy-saving(节能) policeman? A group of 22 energy-saving policemen went to work...
【单选题】—________ does he want to be a police officer? —Because he thinks it interesting to be a police officer. [ ]
A.
Why
B.
How
C.
What
D.
Where
【简答题】在仓库选址的定性分析中,主要以__为基础。
【单选题】There is a police car _____ the bus. The police are watching the traffic.
A.
in front of
B.
in the front of
C.
in the front
【单选题】实现流通加工合理化的途径主要有( )表述完全正确的。
A.
加工跟配送相结合、加工和配套相结合、加工和节约相结合
B.
加工跟配送相结合、加工和配套相结合、加工和合理运输相结合、加工和节约相结合
C.
加工跟配送相结合、加工和合理运输相结合、加工和节约相结合
D.
加工跟配送相结合、加工和配套相结合、加工和合理运输相结合
【简答题】一正方形半导体样品,边长 1mm ,厚度为 0.1mm ,用能量为 3eV ,光强为 0.96mW/cm 2 的光照射在该正方形表面,其量子效率为 1 ,设光生空穴全部被陷而不能运动,电子寿命 τ n =10 -3 s ,电子迁移率 μ n =100cm 2 /V·s ,光照全部被半导体吸收,求:样品光电导率及光电导。
【简答题】听力原文：(A) Police officers are getting into their vehicles. (B) Police officers are driving their vehicles. (C) Police officers are standing near their vehicles. (D) Police officers are backing up their...
【简答题】一正方形半导体样品,边长 1mm ,厚度为 0.1mm ,用能量为 3eV ,光强为 0.96mW/cm 2 的光照射在该正方形表面,其量子效率为 1 ,设光生空穴全部被陷而不能运动,电子寿命 τ n =10 -3 s ,电子迁移率 μ n =100cm 2 /V·s ,光照全部被半导体吸收,求:样品光电导率及光电导。
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