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【单选题】
改变LED芯片的发光颜色需要A.
调整半导体材料的颜色
B.
调整半导体材料的禁带宽度
C.
调整半导体材料的尺寸
D.
调整半导体材料的结晶程度
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【单选题】Which is the most penetrating sub-atomic particle?
A.
neutron
B.
gamma-ray
C.
beta-particle
D.
x-ray
E.
alpha-particle
【简答题】Atomic weight and atomic mass are two important concepts in chemistry and physics. Many people use the terms interchangeably, but they don't actually mean the same thing. Take a look at the difference...
【单选题】The atomic bomb is the most terrible weapon of war _____ man has invented.
A.
when
B.
that
C.
which
D.
with which
【简答题】在烟道中设置采样点时,应将采样点设置在阻力构件,如弯头、接头、变径管段 上 游方向大于几倍直径处?
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