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【单选题】
N型半导体中主要靠（ ）载流子导电。A.
自由电子
B.
空穴
C.
束缚电子
D.
离子
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举一反三
【单选题】向含有Cu（NO 3 ） 2 、Zn（NO 3 ） 2 、Fe（NO 3 ） 3 、AgNO 3 各0.1mol的混合溶液中加入0.1molFe，充分搅拌后Fe溶解，溶液中不存在Fe 3+ ，同时析出0.1mol Ag．．下列结论错误的是（ ）
A.
氧化性：Zn 2+ ＞Cu 2+ ＞Fe 3+ ＞Ag +
B.
Fe 3+ 的氧化性大于Cu 2+
C.
溶液中Cu 2+ 与Fe 2+ 的物质的量比为1：2
D.
1molFe可还原2molFe 3+
【单选题】听力原文： An American U-2 surveillance plane made its first flight over Iraq on Monday in support of the current U.N. inspection mission, marking another concession by Saddam Hussein's regime to stave off...
A.
she protests against military action.
B.
she maneuvers to show its forces.
C.
she intends to defend its country.
D.
she makes another concession.
【单选题】浅绿色的Fe(NO 3 ) 2 溶液中存在着如下的平 衡：Fe 2+ +2H 2 O Fe(OH) 2 +2H + 若在此溶液中加入盐酸，则溶液的颜色变化为 [ ]
A.
绿色变深
B.
浅绿色变得更浅
C.
变黄
D.
无明显变化
【单选题】听力原文： An American U-2 surveillance plane made its first flight over Iraq on Monday in support of the current U.N. inspection mission, marking another concession by Saddam Hussein's regime to stave off...
A.
it protests against military action
B.
it maneuvers to show its forces
C.
it intends to defend its country
D.
it makes another concession
【单选题】听力原文： General Electric reported second-quarter profits of $ 5.4 billion Friday and said it was getting out of the U.S. mortgage business. Profits for the quarter ending June 30 were up by more than 10...
A.
$ 5.4 billion
B.
$4.9 billion
C.
$0.5 billion
D.
$10.3 billion
【简答题】E Babies are not just passing idle time when they stare goggle-eyed at the television—they are actually learning about the world, U.S. researchers said. Parents may want t limit what their babies see ...
【单选题】浅绿色的Fe(NO 3 ) 2 溶液中存在着如下的平衡：Fe 2+ +2H 2 O Fe(OH) 2 +2H + 若在此溶液中加入稀硫酸，则溶液的颜色变化为( )
A.
绿色变深
B.
浅绿色变得更浅
C.
变黄
D.
无明显变化
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