题目内容

Radar is not only to obtain ________ ，but also to measure their distances away from you．

A. brightness of objects
B. color of targets
C. shape of targets
D. bearings of objects

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Of all the extinguishing agents listed below，which one has the greatest capacity for heat

A. Water fog
B. Carbon dioxide
C. Dry chemical
D. Solid stream of water

Our ship is ________ take additional cargo in three ports on her way home．

A. pay attention to
B. planned to
C. in order to
D. have to

Periodic publications notifying changes in，or additions to，previously published navigational data is ________ ．

A. Supplements
B. Annual Summary
C. Navigational Warnings
D. Notice to Mariners

In restricted visibility the safe speed of a vessel without operational radar may be ________ enable effective avoiding action to be taken on sighting another ship．

A. too low to
B. too high to
C. too high for
D. too low for