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【单选题】
透射电镜报话制备样品过程中，预先机械减薄薄膜样品时，要求减薄至A.
几微米
B.
几百微米
C.
几十微米
D.
几十纳米
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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 surfaces 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 surface 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)
【单选题】安装完Hadoop后,需要修改配置文件,需要把jdk的环境变量加载到哪个配置文件中?
A.
core-site.xml
B.
hadoop-env.sh
C.
mapred-site.xml
D.
hdfs-site.xml
【单选题】How did the little prince's planet look like?
A.
It wa a great planet.
B.
It was a small planet.
C.
It was a famous planet.
【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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