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【单选题】
In view of our great performance last year, business____our two countries will develop further.A.
in
B.
on
C.
between
D.
at
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举一反三
【单选题】对反应 3H 2 (g) + N 2 (g) → 2NH 3 (g) 来说,当用 -△[N 2 ] / △t 表示其反应速率时,与此 相当的是( )。
A.
△[NH 3 ] / 2△t
B.
- △[NH 3 ] /2 △t
C.
- 2△[NH 3 ] / △t
D.
2△[NH 3 ] / △t
【单选题】反应3H 2 (g)+N 2 (g)=2NH3(g)的化学平衡常数的表达式是()
A.
K=[NH 3 ]/([N 2 ][H 2 ])
B.
K=[NH 3 ] 2 /([N 2 ][H 2 ])
C.
K=[NH 3 ] 2 /([N 2 ][H 2 ] 3 )
D.
K=([N 2 ][H 2 ] 3 )/[NH 3 ] 2
E.
K=([N 2 ][H 2 ])/[NH 3 ]
【单选题】N 2 (g) + 3H 2 (g) == 2NH 3 (g) 反应前 n 1 ( mol ) 4 9 0 反应某时刻 n 2 ( mol ) 2 3 2 ξ=?
A.
1mol
B.
2mol
C.
3mol
D.
-3mol
【简答题】景象;景色;场面
【简答题】Identify and correct the mistake(s). Note there is no mistake in two of the sentences. Both his parents and his teacher do not believe that the boy lied.
【单选题】Both his parents and teacher ____ proud of _____.
A.
are; he
B.
are; him
C.
is; him
D.
is; his
【简答题】从下列所给词中选择合适的词,并用其正确形式填空。 appreciate assign continue equipment excellent invite range service source task unable work(v.) He won the first prize for his __...
【简答题】请依据下雪常识,用flash模拟设计制作一个下雪动画。包括雪花设计、背景设计、编程设计。
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