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【单选题】
若电极反应Cu–2e- → Cu 2+ 在某一阴极电位下的净反应电流密度为 i (mA/cm 2 ),则Cu金属的溶解速度为A.
2 ´ F ´ i (mmol·cm -2 ·s -1 )
B.
2 i /F (mmol·cm -2 ·s -1 )
C.
2 F/ i (mmol·cm -2 ·s -1 )
D.
(1/2) i /F (mmol·cm -2 ·s -1 )
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举一反三
【单选题】Ancient cave art and more recent paintings and sculpture illustrate only people's fear about bears.
A.
Y
B.
N
C.
NG
【单选题】Who said 'The only thing we have to fear is fear itself'?
A.
Abraham Lincoln.
B.
Winston Churchill.
C.
John F. Kennedy.
D.
Franklin D.Roosevelt.
【简答题】Franklin Roosevelt told the Americans that the only thing we have to fear is ________.
【单选题】The most destructive element in the human mind is fear．Only when we are no longer afraid _______ to live．
A.
we are beginning
B.
begin we
C.
we begin
D.
do we begin
【单选题】'The only thing we have to fear is fear itself' meant that ______.
A.
Americans would lose if they gave way to fear
B.
Americans have no real troubles during the 1930s
C.
F. D. R. would solve America's problems because he was not afraid
D.
Americans were in trouble because they hadn't looked at their troubles with clear heads
【单选题】Fear becomes a problem only when ______ .
A.
the danger is thought greater than it really is
B.
eth danger is ore psychological than physical
C.
one cannot stand the danger
D.
one is not well prepared for it
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