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【单选题】
已知反应2NO 2 -+2I-+4H + →I 2 +2NO+2H 2 O的速率方程式为: v = kc (NO 2 -) c (I-)[ c (H + )] 2 。某浓度时反应速率为 v 1 ,如果各反应物浓度均增加一倍时,该反应的反应速率 v 2 为( )。A.
256 v 1
B.
8v 1
C.
16 v 1
D.
4 v 1
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【单选题】According to Steven, what is the best scenario of the issue?
A.
That America, not Israel conducts the attack.
B.
That people inside Iran overthrow the government.
C.
That Iran gets its way.
D.
That America wages a war on Iran and forces a regime change.
【简答题】Peter: What are you doing for vacation, Steven? Steven: I’m visiting my aunt in San Francisco. My brother’s staying there. He’s joining a club. Peter: Oh? When are you going? Steven: Next Friday...
【单选题】—What are they talking about? —A new film _______ by Steven Spielberg who is a very famous director in the USA. [ ] A. produced
B.
was produced
C.
producing
D.
will be produced
【简答题】串联负反馈只有在信号源内阻（）时，其反馈效果才显著。
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