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【单选题】
空气洁净度等级可分为（ ）。 A．百级 B． C．十 D．三十A.
百级
B.
C.
十万级
D.
三十万级
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【简答题】Before long they set about (look for) a home in Yucca, Arizona.
【单选题】1983年，美国国家航空航天局（NASA）地球系统科学委员会将（）作为地球系统科学的最终目标。
A.
探讨地球的本质问题
B.
地球与宇宙的关系探索
C.
人与地球之间的相互作用研究
D.
透视和理解地球系统随时间的演化
【简答题】阅读理解。 Long before they can talk children often use body language to show us how they are feeling. If they hang around their mothers quietly, it is easy to tell that they are nervous. Mothers also know...
【简答题】完形填空 Children often use body language to show us how they are feeling long before they can talk. If they __ 1 __their mothers quietly, it is easy to tell that they are__ 2 __. Mothers also know that t...
【单选题】. They were so______on their chess game that the sun had long set before they called it a day.
A.
intented
B.
intention
C.
intent
D.
intentional
【单选题】铝合金发动机汽缸盖下平面的平面度误差每任意 50mm × 50mm 的范围内均应不大于 ( )mm 。
A.
、 0.015
B.
、 0.025
C.
、 0.035
D.
、 0.045
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