A.lineB.threadC.aerialD.wireThe （）（天线）is like a dish.……

单项选择题This is a radio （）（测向仪）.

A.compass
B.direction finder
C.loran
D.sextant

单项选择题The ship’s（）（天文钟）is a very accurate clock.

A.watch
B.chronometer
C.time
D.clock

单项选择题The bosun is good at（）(打绳结).

A. knotting line
B. making knots
C. knots
D .making line

单项选择题The third officer is （） (负责)the fire-fighting equipment.

A. responsible
B. take charge of
C. in charge of
D. control

单项选择题（）(舵角多少)？ ----Twenty degrees on port.

A. How answers
B. What rudder
C. How rudder
D.B+C