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【简答题】
（9）关于误码率的描述中，正确的是 A）描述二进制数据在通信系统中 B）用于衡量通信系统在靠正常状态下的传输可靠性 C）通信系统的造价与其对误码率的要求无关 D）采用电话线的通信系统不需要控制误码率
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皮皮学刷刷变学霸
举一反三
【单选题】—How do you go to school every day? —I ____ , but I ____ by bike a year ago.
A.
go to school by foot; went
B.
would go to school on foot; liked to go
C.
walk; used to go
D.
will walk to go school; was used to going
【单选题】— How do you go to the office every day? — I often go to the office _____ subway. Sometimes I _____ a taxi. [ ]
A.
by; take
B.
by; by
C.
take; by
D.
take; take