下列信号中, 属于“操作”
A. BUS→PC
B. PC→MAR
C. (PC)+1
D. MDR→BUS
The old Silk Road _______ China with the West in ancient times.
A. tied
B. combined
C. stuck
D. linked
Google is one of the largest________ in online searching engine field.
A. employers
B. employees
C. employ
D. employment
小信号选频放大器的通频带太窄,会使被放大的信号产生( )(非线性、线性、频率)失真。增宽其通频带,可在LC谐振回路两端并上一只( )(电阻、电容、电感),此时通频带宽了,但谐振电压增益( )(不变、增大、减小),选择性( )(不变、变好、变差)。