When you want to make sure whether you are understood, you could say ___________
A. So is everyone clear on what they have to do?
B. OK,do you understand how this works now？
C. Does that make sense to you?
D. Any questions about what you need to do?
查看答案
Which of the following words could be used when explaining something step by step?
A. first
B. next
C. second
D. finally
Match the English phrases with their Chinese meanings.
多谐振荡器有一个稳态和一个暂稳态。
A. 对
B. 错
数字电路中，获得脉冲信号的方法有两种，一种是由脉冲振荡器产生；另一种是利用整形电路。
A. 对
B. 错
微信支付 
支付宝支付