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【单选题】
注意的基本功能是:A.
控制功能
B.
选择功能
C.
跟踪和保持功能
D.
调节功能
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反馈参考答案：
举一反三
【单选题】Which of the following server roles sends out a time signal for clients to synchronize with a clock？（）
A.
DHCP
B.
NTP
C.
SMTP
D.
DNS
【简答题】The time _________ each control signal is sent is carefully controlled by a digital clock.
【简答题】The counter counts upwards starting from "0000" until it reaches an output "1111" on each rising edge of the input clock signal:on each rising edge of the input clock signal
【简答题】The clock signal need not be a square wave(方波), although it often is.
【单选题】(2011·江西)It ________ be the postman at the door.It's only six o'clock.
A.
mustn't
B.
can't
C.
won't
D.
needn't
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