單項(xiàng)選擇題

Radar reflectors are required for（）.

A.all fishing vessels over 39 feet in length
B.sail-propelled fishing vessels
C.all fishing vessels of less than 200 GT
D.wooden hull fishing vessels with a poor radar echo

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單項(xiàng)選擇題

PPI is（）.

A.a plan-position indicator system
B.pulse-plan integration
C.pulse-pulse input
D.power-plan input

單項(xiàng)選擇題

Although manual plotting for CPA works well，the workload can become overwhelming when confronted with（）.

A.one target
B.two targets
C.three targets
D.a large number of targets

R﻿adar reflectors are required for（）.

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PPI is（）.

Although manual plotting for CPA works well，the workload can become overwhelming when confronted with（）.

Radar reflectors are required for（）.