单项选择题
A.4 B.9 C.8 D.5
A.the weather over there is always terrible B.the condition there is complicated C.the signals are too strong D.their SES may receive the signals from unwanted satellite
A.sometimes B.all times C.never D.partly
A.the only preamble B.a part of the preamble C.the closing D.the suspension
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