原式=(-16)×(-60)-(-512)×(-60)+215×(-60)=10-25-8=-23.
Hosting the Olympic Games is a great honor and a great ________ for a country. [ ]
A. favour
B. effort
C. responsibility
D. endeavour
有两个电容器,其中C1=2000±40pF,C2=470pF±5%,问哪个电容器的误差大些?为什么?