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【单选题】
()的光分解引发了一系列的反应,它是对流大气中O3的一个来源。A.
NO2
B.
NO
C.
N2O
D.
N2O5
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【简答题】曲柄滑块机构是曲柄摇杆机构中长度趋向无穷大时演变而来;不改变曲柄滑块机构中构件 _______ 的尺寸,只将其曲柄固定作为机架,就转化成为 机构。
【简答题】How did the Cold War era contribute to the evolution of modern emergency management?
【单选题】Whatever we do should _____ the environment. [ ]
A.
contribute for protecting
B.
contribute to protect
C.
contribute to protecting
D.
contribute in protect
【简答题】Staying married is a challenge in modern society. What are some of the factors that contribute to this difficulty?
【单选题】The author believes that new technologies contribute to the workaholics of modern people.
A.
Y
B.
N
C.
NG
【单选题】What mostly contribute to modern Chinese youth’s independence and confidence?
A.
Improvement of their education and the fast development of Chinese economy.
B.
Improvement of their life quality and better care from their parents.
C.
Cultivation of good virtues and moralities.
D.
Acquirement of more skills.
【简答题】曲柄滑块机构是改变曲柄摇杆机构中的_____长度和形状而形成的。在曲柄滑块机构中改变_____ 转动副尺寸形成偏心轮机构。在曲柄滑块机构中以_____为机架而得到回转导杆机构。
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