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【简答题】
哥伦比亚号航天飞机曾用金属铝粉和高氯酸铵( NH4 ClO4)的混合物作固体燃料。在该固体燃料中，铝元素、氮元素及氯元素的化合价分别是 [ ] A．+3价、-3价、+7价 B．0价、-3价、+7价 C．+3价、+3价、+5价 D．0价、+1价、-1价
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参考解析：
刷刷题刷刷变学霸
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【单选题】Human Space Exploration While scientists are searching the cause of the Columbia disaster, NASA is moving ahead with plans to develop a new craft that would replace shuttles (航天飞机) on space station mi...
A.
ontrol the International Space Station.
B.
arry astronauts to the International Space Station.
C.
ransport equipment to the International Space Station.
D.
rain astronauts in space flights．