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【简答题】
当细胞受刺激时,膜电位减小,产生去极化,达到某一个临界值时就产生动作电位。这一能引起细胞产生动作电位的临界值称为_________,它是导致__________通道开放的关键因素。
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【单选题】_____ is well-known to all that the 2016 Olympic Games will be held in Rio de Janeiro, Brazil. [ ]
A.
As
B.
What
C.
That
D.
It
【单选题】Rio De Janeiro, ___________the right to host the 2016 Olympic Games, will be occupied in building stadiums.
A.
winning
B.
won
C.
having won
D.
to win
【单选题】is known to us is that the 2016 Olympic Games will be held in Rio de Janeiro, Brazil.
A.
It
B.
Which
C.
As
D.
What
【简答题】Being a volunteer for the 2016 Olympic s in Rio de Janeiro, Brazil is your strong wish. Write a letter to the Rio de Janeiro Olympic Committee to state your application to be a volunteer, describe...
【单选题】_______is known to us all is that the 2016 Olympic Games will take place in Rio de Janeiro. [ ]
A.
What
B.
which
C.
As
D.
It
【简答题】每个电压中,开关元件多次通断,使电压斩波成多个 ____
【单选题】The Rio 2016 Olympic torch( 火炬 )began 95-day journey in Brazil on May 3rd.
A.
it
B.
its
C.
it's
D.
itself
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