Solar cells have been developed primarily to ____ electric power for spacecraft.
时间:2019-08-20 11:32来源:未知 作者:admin 点击:
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(单选题) 23: Solar cells have been developed primarily to ____ electric power for spacecraft.
A: ensure
B: store
C: secure
D: provide
(单 选题) 23: Solar cells have been developed primarily to ____ electric power for spacecraft.
A: ensure
B: store
C: secure
D: provide
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