power transmission means sending electric power to somewhere far away

When the current in a power transmission line is increased, the power loss _____.

A.increases as the square of the current

B.decreases as the square root of the current

C.remains the same, as it is independent of current flow

D.increases in direct proportion as the current

The range of a SSB transmission is MOST affected by ______．

A.Atmospheric noise and radiated power

B.The frequency band selected and time of day or night

C.Interference and position of the moon

D.Radiated power and nearness to shore

For free space transmission, if the transmi power is, the receive power is, and the propagation distance is d, then the correct formulas include a., where k is a constant. b., where k is a constant. c., where k is a constant. d., where k is a constant.

A、错

B、对

C、对

D、对

A. DPCT（Dual Power Combining Transmission）

B. DDT（Delay Diversity Transmission）

C. FWDR（Four Way Diversity Receiving）

D. IRC（Interference Rejection Combining）

A.Assignment of Traffic Channel to the MS

B.Transmission of Short Messages

C.Adaptive Power Control information from BTS to MS only

D.Authentication

(86)

A.43dBm

B.-7dB

C.-3dB

D.53dBm

A、normal module of gears

B、rotation speed

C、I/O power

D、torque of each shaft