在无流海域,当风速为10m/s时,冰山的移速约为。
A. 0.2m/s
B. 2.0m/s
C. 5.0m/s
D. 10.0m/s
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When the relative motion display is selected all tracked objects will display ______ vectors.
A. motion
B. stationary
C. dynamical
D. flashing
What is used to correct for both induced and permanent magnetism,and consequently must be
A. Flinders bar
B. Soft iron spheres
C. Fore-and-aft permanent magnets in their trays
D. Heeling magnet
Pollution regulations require that each scupper in an enclosed deck area have a ______.
A. Wooden plug
B. Soft rubber plug
C. Two-piece soft patch
D. Mechanical means of closing