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【单选题】
下列描述不正确的是A.
单稳态触发器具有一个稳态、一个暂稳态，暂稳态是其主要性能体现
B.
单稳态触发器的暂稳态维持的时间与触发脉冲紧密相关。
C.
555 定时器可方便地构成单稳态触发器。
D.
多谐振荡器为无稳态电路。
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【简答题】用所给动词的适当形式填空。 1. What time ______ you _____ (get) up in the morning? 2. Oh, it's seven o'clock. It's time ________ (go) to school. 3. The box is too heavy. Let me _________ (help) you. 4. Lily _______...
【简答题】把数学知识转化为教育形态,一是靠 ,二是要借助人文精神的融合。 (5.2)
【简答题】根据句意及汉语提示写出单词，并用其适当的形式填空。 1. Please show me your _____ (计划) of new term. 2. Don't be _____ (生气), he is a child only. 3. They are talking about his _____ (病). 4. He _____ (相信) he will be better soon. 5...
【单选题】在国外不少地方垃圾桶上都用中文写着“请不要乱扔垃圾”,央视以此为背景特别制作了一则广告“中文应该被这样使用吗?”要做到中文不被这样使用,需要每个公民( )。
A.
行使监督权，监督公民出境行为
B.
履行维护国家荣誉的义务
C.
将个人命运与国家前途结合起来
D.
放弃去国外旅游
【简答题】用动词的适当形式填空。 1. Tom, _____________ (not walk) on the grass. 2. The geese ____________ (catch) the fish now. 3. My grandma ____________ (watch)TV every day. 4. His parents ___________ (go) to Beijing la...
【简答题】此题代表试卷上第 45 题。只写字母大写编号作为答案。
【简答题】用所给动词的适当形式填空。 1. Look! The girls ______ (write) on the wall. 2. Would you like something ______ (eat)? 3. Don't ______ (stand) behind the wall! 4. I want ______ (take) some books to the classroom. 5. ...
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