题目内容

网络层中用于传送有关通信问题消息的是:（）

A. TCP
B. ICMP
C. UDP
D. SNMP

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更多问题

利用 Access 2010 创建的数据库文件,其默认的扩展名为（）

A. mdf
B. dbf
C. mdb
D. accdb

Helen go on the trip with us, but she isn’t quite sure yet.shllB．mustC．myD．cnHelen\ go on the trip with us, but she isn’t quite sure yet.shll B．must C．my D．cn

A. shall
B. must
C. may
D. can

— My I spek to Mry — This is speking.I B．meC．sheD．hers— My I spek to Mry — This is speking.I B．me C．she D．hers

A. I
B. me
C. she
D. hers

--__________ I speak to Mary --Speaking.

A. Must
B. Need
C. May
D. Shall