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【多选题】
下列关于3D技术的论述，正确的有( )。A.
电影院中商用化的3D放映技术主要包括主动立体、被动立体和光谱立体
B.
3D成像的原理是人两眼的视觉差
C.
3D是“Three Dimensions”的简称，中文是指三维
D.
3D显示技术可以分为眼镜式和裸眼式两大类，日常生活中以眼镜式较为多见
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举一反三
【单选题】To our great surprise,we have made ______ profitst as we expected despite the economis crisis throughout the world.
A.
twice as many
B.
twice many
C.
twice many as
D.
as twice many
【单选题】Variables such as individual and corporate behavior. ______ nearly impossible for economists to forecast economic trends with precision.
A.
make
B.
to make it
C.
it makes
D.
make it
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