Radar bandwidth is normally（）to the range scale and the associated pulse length.

A . 12 percent B . 6 percent C . 18 percent D . 24 percent

A . Raising the antenna height increases the radar range B . The ability of radar to detect objects is unaffected by weather conditions C . Radar bearings are less accurate than radar ranges D . Radar should be checked regularly during clear weather to ensure that it is operating properly

A . The Master of the vessel must be on the bridge when the radar is in use B . The radar equipment is only required to be used in restricted visibility C . The use of a radar excuses a vessel from the need of a look-out D . This equipment must be used to obtain early warning of risk of collisio

A . sweep introduction B . sweep interest C . sweep intention D . sweep intensity

A . for portable fenders B . for ground tackle C . on the inside of the hawsepipe D . on mooring line

A . 64 kb/s B . 91.2 kb/s C . 173 kb/s D . 183 kb/s E . 211 kb/

A . DS-1; E1 B . DS-1; STM-1 C . OC-3; STM-1 D . STS-1; STM-1 E . OC-192; STM-192

A、Gain control B、Sensitivity time control C、Fast time constant D、Pulse length control

A . unstabilized display B . stabilized display C . composition display D . relative display

A . close B . open C . switch off D . switch o

A . on the same course as your vessel B . at the same speed as your vessel C . on the same course and speed as your vessel D . on a reciprocal course at the same speed as your vessel

A . 6 percent B . 12 percent C . 18 percent D . 24 percent

A . switch on B . switch off C . close D . ope

A、KEYLOCK B、REPEATER C、STATIC INVERTER D、ANTI-CLUTTER-SEA

A . relative display B . composite display C . stabilized display D . unstabilized display

A . unwanted interference B . unexpected figures C . abnormal data D . unwanted informatio

A . used B . available C . in use D . can be used

A . To receive the high-frequency pulses from the transmitter B . To focus the pulses into a beam，and send them into space C . To pick up reflected pulses coming from objects that have been struck by the beam D . To reflect microwave

A . closest point to approach B . close point to approach C . crossing point to approch D . coming point to approach

A . 1 B . 64 C . 1562 D . 64000 E . 1500

A．hazy red B．yellow C．re D．amber

A.crossing point to approach B.fog or steady rain C.closest point to approach D.close point to approach