Your radar is set on a true motion display．Which of the following will NOT appear to move
A. Echoes from a buoy
B. Own ship's marker
C. Echo from a ship on the same course at the same speed
D. Echo from a ship on a reciprocal course at the same speed
查看答案
Your ARPA has automatic speed inputs from the log．Due to currents，the log is indicating a
A. The generated CPA will be less than the actual CPA
B. The generated TCPA will be later than the actual TCPA
C. The range of initial target acquisition will be less than normal
D. The targets true course vector will be in error
You have another ship overtaking you close aboard to starboard．You have 3 radar targets bearing 090° relative at ranges of 0.5 mile，1 mile，and 1.5 miles．In this case，the unwanted echoes are called ______．
A. Multiple echoes
B. Spoking
C. Indirect echoes
D. Side-lobe echoes
The development of ______ led to the fully automatic ARPA systems installed on commercial
A. SeaTalk
B. powerful microprocessors and mega memory capacity
C. chartplotter
D. small-scale chart
引起出血性肠炎和溶血性尿毒综合症的细菌是
A. ETEC
B. EHEC
C. EPEC
D. EIEC
EAggEC
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