核电设施泄漏产生辐射时,人们需服用非放射性碘片(标签如图),保障该碘在甲状腺里达到饱和,以减少放射性碘(相对原子质量为131)的吸收。有关表述正确的是( )
两种碘相对原子质量相等
碘片属于纯净物
标签中KI的相对分子质量为170
两种碘对人体影响不同
Alex believes he will soon be able to play chess as ______ as the computer.( )
well
better
best
the best
Did the policeman give much _______ on how to protect personal information?( )
note
tip
advice
book
_______ knowledge and experience are important to finish that task.( )
Either
Neither
None
Both
The headmaster introduced ______ to the German visitors before the welcome party.( )
we
us
our
ours
Shirley is still waiting for her flight to New York City ____ the airport.( )
at
under
on
with