a.more precise
b.absolutely accurate
c.more durable
d.indestructible
2.The heart of the atomichron is _______.
a.acesium atom
b.an ammonia molecule
c.a nitrogen atom
d.a hydrogen
3.From theselection,we may assume that temperature changes_______.
a.affect only ammonia molecules
b.may affect the vibration rate of atoms
c.affect the speed at which atoms travel
d.do not affect atoms in any way
4.Identical atomic clocks may be used to check______.
a.the effect of outer space on an atomic clock
b.the actual speed of an orbiting satelite
c.the accuacy of predictions based on theories of relativity
d.all of Einsteins theories
5.Implied but not stated:_______.
a.Precise timekeeping is essential in science
b.Scientists expect to disprove Einsteins relativity theories
c.Atomic clocks will be important in space flight
d.The rate of vibration of an atom never varies
答案:aabcc
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