【单选题】LC并联谐振回路,当回路的工作频率大于回路的谐振频率时,回路呈( )。
【简答题】本项目中,我们采用( )实现让数码管分别接收相应数值的目的。
【单选题】In the first picture, what is the man going to do?
A.
He is going to Wuhan to save his relative who have contracted the new coronavirus.
B.
He is going to Wuhan to develop the medicine to cure the people who have infected the new coronavirus.
C.
He is going to Wuhan to help the people who have infected the new coronavirus.
D.
He is going to Wuhan to see his relatives and friends who are free from new coronavirus.
【单选题】How many types of differeces are there in the first picture on the PPT.