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【多选题】
液压系统中常用的油管有（）A.
铜管
B.
橡胶管
C.
钢管
D.
尼龙管
E.
塑料管
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【简答题】The smooth space flight, experts say, marks a big ____________ for Chinese scientists.
【单选题】The smooth space flight, experts say, marks a big ____________ for Chinese scientists.
A.
creative
B.
breakthrough
【简答题】Looking back on China's road to outer space, people can easily find it has not been very smooth．In the past years, Chinese people have made hard and determined efforts to realize the dream their ances...
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