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【多选题】
串行通信按数据传送方式可分为( )两种形式。A.
全双工方式通信
B.
半双工方式通信
C.
异步通信
D.
同步通信 【参考答案】串行通信按数据传送方式可分为异步通信和同步通信两种形式。
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反馈参考答案：
举一反三
【单选题】______ I saw the machine, I could not have imagined how efficiently it works.
A.
But for
B.
Because
C.
But that
D.
If
【单选题】--------Have you asked somebody to repair the machine? --------Oh, sorry, I forgot it. I _________for an engineer at once.
A.
am going to send
B.
would send
C.
have sent
D.
will send
【单选题】I developed very slowly and it took nearly two hundred years I was built as an analytical machine by Charles Babbage.
A.
before
B.
after
C.
long
D.
short
【单选题】The washing machine ___ last Wednesday works well.
A.
I bought
B.
I bought it
C.
which I buy
D.
that I bought it
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