2. 外语
  3. Communication satellites generally use solar cells as their source of electric power, although some test satellites have used th

Communication satellites generally use solar cells as their source of electric power, although some test satellites have used th

admin2010-01-13  89
问题 Communication satellites generally use solar cells as their source of electric power, although some test satellites have used thermoelectric generators.
选项 A、superior
B、authorized
C、former
D、experimental
答案D
解析
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