__________ something goes wrong, I’ll see you next week.
A. Unless
B. If
C. What
D. Where
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You can take __________ you like from the gifts.
A. Unless
B. whatever
C. whichever
D. Wherever
[音频]W: Hi. 1)__________________Alice.M: Hi. I'm Steven. 2)________________W: Nice to meet you, too. So 3)__________ do you do ?M: I' m a teacher.W: Oh, really. That's nice.M: What do you do?W: 4)____________ a doctor.M: So what do you like to do in your spare time?W: 5)_________________ to music. 6)_____________you?M: I like reading.
用待传输的基带信号去控制高频载波的某一参量称为调制,根据控制高频载波参量的不同,可以分为调幅,调频和调相,对于我们在实验课中所组装的收音机其调制类型为( )
A. 调幅
B. 调频
C. 调相
D. 调角
锁相环路根据初始状态不同有两种自动调节过程。若环路初始状态是锁定的,因某中原因使频率发生变化,环路通过自身的调节来维持锁定的过程称为( )
A. 跟踪过程
B. 捕捉过程
C. 锁定过程