某物理接口信号线的长度不超过15m,其数据传输率在20kbps以内,则它是()标准的接口。
A.RS-232
B.RS-422
C.RS-423
D.X.21
参考答案:A
Professor Li has earned a world ____ with his pioneer research in biochemistry.
A.name
B.reputation
C.influence
D.feature
共用部分的维修养护费用从什么中进行支付?