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【单选题】
在Excel2010中,选中区域A1:F5,要将100填充到整个区域A1:F5,则输入整数100后,应使用组合键______结束输入。A.
Alt + Enter
B.
Tab + Enter
C.
Ctrl + Enter
D.
Shift + Enter
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【简答题】A.Colorado. B.Arizona. C.The Nile River. D.The Museum of Natural History,
【多选题】天然气含H2S多少的分类Classification of how much H2S natural gas contains（）
A.
无硫或微含硫天然气 H2S和CO2含量符合管输要求，不需要净化The content of H2S and CO2 in sulfur-free or slightly sulfur-containing natural gas meets the requirements of pipeline transportation and does not require purification；
B.
低含硫天然气 H2S含量约为0.0001～0.5％（体积）H2S content of low-sulfur natural gas is about 0.0001 ~ 0.5% (volume)；
C.
中含硫天然气 H2S含量约为1～1.5％（体 积），CO2含量约为6～8％（体积）H2S content of natural gas containing sulfur is about 1-1.5% (volume), and CO2 content is about 6-8% (volume).；
D.
高含硫天然气 H2S含量一般为4～8％（体积）high sulfur natural gas：H2S content of high-sulfur natural gas is generally 4-8% (volume)
【单选题】The description of the past natural environment is important in that
A.
it is one part of human history:
B.
it should be included in the history of the universe.
C.
it can partly explain the way of life of the people in the past.
D.
it decided the human history,