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在很多实验测量中要求系统达到，但绝对的是无法得到的。在误差允许范围内，通常用准状态来代替。下列实验的准状态如何判断？ 1.蒸气压测量中的沸点测量； 2.分解反应中分解压测量； 3.甲酸氧化反应动力学测定中溴生成； 4.燃烧热测定实验中氧弹与水的热量传递。
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【单选题】First Planet from the Sun Mercury, the planet nearest the sun, is difficult to observe from the Earth because it rises and sets within two hours of the sun. ______【46】 Planetary scientists can estimat...
A.
Some regions on Mercury are heavily cratered, suggesting that they are very old suces that were probably formed about 4 billion years ago
B.
The crater was probably created by the impact of a large planetesimal when Mercury was forming
C.
Consequently, little was known about the planet until the Mariner 10 spacecraft made several flybys in 1974 and 1975
D.
Mercury is much smaller than the Earth
E.
The suce gravity is about one-third as strong as Earth's, and a thin atmosphere surrounds the planet
F.
These plains have relatively few impact craters (46)
【简答题】Which planet is the closest planet to the sun? Mercury, Mars, Venus or Jupiter?
【简答题】Our planet is in trouble．Polluting industries and corporations are destroying our planet, resulting in increasing global temperatures, melting ice caps, and economic turmoil（混乱）．All across the country...
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