gyrocompass（）

A.accurate only in the Polar regions

B.accurate electronic servomechanisms

C.hand operated

D.accurate only if the vessel is underway

A.VHF

B.Radar

C.Chart

D.Gyro-compass

A.high or low

B.AC or DC

C.srong or weak

D.on or off

A.east two degrees

B.two degrees east

C.two east degrees

D.two-degrees east

A.Spider element

B.Sensitive element

C.Link arm

D.Pickup transformer

A.Its accuracy remains the same at all latitudes

B.It seeks the true meridian

C.It can be used near the Earth's magnetic poles

D.If an error exists，it is the same on all headings

A.Spider element

B.Mercury ballistic

C.Gyrotron

D.Rotor

A.follow-up system

B.transmitter

C.phantom element

D.azimuth motor

A.Comparing the gyro azimuth of a celestial body with the computed azimuth of the body

B.Comparing the gyro heading with the magnetic compass heading

C.Determining from the chart the course made good between celestial fixes

D.It cannot be determined accurately at sea due to drift of unknown currents

A.Cargo unit

B.Dangerous cargo container

C.Doppler speed log

D.Gyro-compass and autopilot