Before Yuri Gagarin’s first space flight,______
A.it showed that man’s health was not affected by weightlessness
B.he was afraid of being endangered by high levels of radiation
C.he thought that man couldn’t live in space for long periods of time
D.man thought that his physical and mental capabilities might be affected by many factors that were not present on earth
A.it showed that man’s health was not affected by weightlessness
B.he was afraid of being endangered by high levels of radiation
C.he thought that man couldn’t live in space for long periods of time
D.man thought that his physical and mental capabilities might be affected by many factors that were not present on earth
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Hóa Học lớp 12
