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【单选题】
肼(N 2 H 4 )是一种无色油状液体,有刺激性气味,有吸湿性。点燃时,迅速而完全燃烧,生成 N 2 和 H 2 O,并放出大量的热。下列有关N 2 H 4 的说法不正确的是A.
应密封保存
B.
完全燃烧的反应属于复分解反应
C.
可用作燃料
D.
其中氮元素与氢元素的质量比为
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A.
for
B.
with
C.
in
D.
at
【简答题】Translate the following sentences into Chinese. (1) As requested, we now offer you 500 tons of walnut meat as follows. (2) If you think this offer acceptable, please cable us immediately for our confi...
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A.
offer,on
B.
quote,for
C.
offer,in
D.
offer,for
【简答题】打印以下形式的数据: 1
0 0 0 0 2
1 0 0 0 2
2 1 0 0 2
2 2 1 0 2
2 2 2 1
【单选题】We offer you for 500 sets sewing machines _____ $ 50 ______ CIF Lagos basis _________ July shipment.
A.
for, in ,at
B.
at, on, for
C.
on, at, in
D.
for, in, on
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