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【单选题】
在卫星线路中，信号延迟产生的原因是一。A.
通信距离太远
B.
天线附近有障碍物
C.
通信线路中存在不匹配现象
D.
B十C
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A.
committed
B.
commit
C.
committing
D.
been committed
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