1999年3月以后制造的SKF197726型轴承大修后,使用时间满()报废。
A.5年
B.4.5年
C.5年(或50万km)
D.7年
参考答案:D
The most widely used LAN system is ______ which adopts a form of access known as CSMA-CD.
A.Ethemet
B.ATM
C.FDDI
D.Wireless
The lady is always _____ in white at the party. [ ]
A. wearing
B. dressing
C. worn
D. dressed