题目内容

图样中，机件的对称中心线和轴线用（）画出。

A. 细实线
B. 虚线
C. 点划线
D. 双点划线

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—_____ this your bag?

A. Yes,________
B. Is; it’s
C. Is; it is
Do; it do

The () layer of the OSI model organizes bits from the physical layer into logical data units called frames.

A. physical
B. data-link
C. network
D. transport

() is a protocol used for transferring files.

A. FTP
B. SMTP
C. TELNET
D. HTTP

() is a protocol that can access and transfer documents on the WWW.

A. FTP
B. SMTP
C. TELNET
D. HTTP