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【多选题】
放大器反向饱和时,检测到的心电信号会出现( )A.
T波下部削掉
B.
R波顶部削掉
C.
基线漂移
D.
Q波下部削掉
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【简答题】听录音,完成填空。 Brian : Hi, Susan. I sent you a message on (1) _______ this morning. Have you received it? Susan : Oh, I am sorry. I had class this morning, so I didn't check my (2) _____________. What's up...
【简答题】用所给动词的适当形式填空 A. Tom and Mary _____1______ (come) to china last month. B. Mike didn't _____2____( go) to bed until 12 o’clock last night. So I ___3____ (get ) up late. C. Mary _____4_____ (read) an En...
【简答题】听下面一段材料，回答第1-3题。 1. When did Shirley begin taking piano lessons? A. In 1934 B. In 1938 C. In 1951 2. What did Shirley plan to do as a career when she studied at Howard University? A. Play Jazz B. Play...
【简答题】完形填空 When I first ate in a western restaurant, I didn't know what I was supposed to do. Everything was l . I was used to _ 2 with chopsticks and a spoon, but I had to eat with a knife, a fork and a sp...
【简答题】Serena: So, 1 ... with the divorce and everything? Blair: Great. So my dad left her for another man. She's lost 15 pounds, got an eye-lift (眼部提升手术) . It's been 2 . Serena: I'm really sorry. Blair: Yea...
【简答题】探究：音调是怎样变化的． 提出问题：要改变音调，就必须改变振动频率． 猜测和假设：振动频率与物体紧密、长度、厚度有关． 探究器材：粗、细、长短不同的弦若干根、一张共鸣板． 设计实验： 实验一：物体越绷紧，振动越快，它的音调越高，反之音调越低． 器材：弦A和弦B的粗细、长度相同，弦A比弦B绷得紧． 做法：拨动这两根弦，如图所示． 实验二：物体越短，振动越 ______，它的音调越 ______，反之...
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