单项选择题


A．hydraulic
B．electrical
C．solar
D．atomic
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单项选择题
A．At the same timeB．On the contraryC．For exampleD．In a word
A．At the same time
B．On the contrary
C．For example
D．In a word
单项选择题
The harm radiation has done to the Apollo crew members ______.
A．is insignificant
B．seems overestimated
C．is enormous
D．remains unknown
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