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问题
填空题
信号分为数字信号和______信号两类。
答案
参考答案：
模拟
填空题
从方框中选择适当的词或词组，并用其恰当的形式填空
Go off, show, ring, oversleep, lock
l. They told us to______ our tickets
2. The bell is______. It' s time for class.
3. My alarm clock didn't
_____ yesterday morning.
4. —Have you ever______ your keys in your house and was late for work?
—Yes, I have
.
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单项选择题
目前4#板坯铸机中间包浸入式水口快换技术采用动力为（）。
A.液压
B.压缩空气
C.氮气N2
D.氩气Ar
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