Several minutes after its launch, the X-37B plane successfully sent back its firstto the c

发布时间：2020-08-16 10:13:08


Several minutes after its launch, the X-37B plane successfully sent back its first    to the control center.
A. mark
B. sign
C. instruction
D. signal

网友回答

A. mark
B. sign
C. instruction
(答案→)D. signal
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