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航空运输的单位成本很高，主要适合救灾抢险用的紧急需要物资、贵重及高档货物、鲜活商品的运输。A.
正确
B.
错误
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【简答题】根据句意和汉语提示,补全单词. 1. It is a fact that English is being (接受)as an international language. 2. People travel to meet new friends, to try new food, and to (体验)life in other parts of the world. 3. She found...
【简答题】圆柱的体积是______的圆锥体积的3倍，所以圆锥体积的公式是______．
【单选题】_______ people went to the concert which was held in Gengsu Theatre ________ the night of April 1 st .
A.
Thousands of; in
B.
Thousand of; on
C.
Many thousand; in
D.
Thousands of; on
【单选题】The spaceman returned to Earth and safely landed in that area _____ the night of April 29. [ ]
A.
in
B.
on
C.
at
D.
by
【简答题】学习“圆柱体的体积”时，是把圆柱体转化成学过的______体，并推导出圆柱体体积公式．
【简答题】球的体积公式是：球体体积= 4 3 π r 3 ．请用公式计算直径为2.45米的球的体积（用计算器计算，保留两个有效数字，π取3.14．）
【单选题】_________ people went to the concert that was held in Jinyun Square __________ the night of April 25.
A.
Thousands of; in
B.
Two thousands; on
C.
Thousands of; on
D.
Many thousand; in
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