单项选择题
A.coherent
B.atomic
C.laser
D.electronic
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单项选择题
A.isB.signalsC.stands forD.indicates
A.is
B.signals
C.stands for
D.indicates
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单项选择题
A.withinB.withC.fromD.less
A.within
B.with
C.from
D.less
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