單項選擇題

No assumptions（）on the basis of scanty information，especially scanty radar information.

A.should not be made
B.are not to be taken
C.should be taken
D.shall be made

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單項選擇題

My radar is not working.I require shore based radar assistance.Is shore based radar assistance（）?

A.used
B.available
C.in use
D.can be used

單項選擇題

It may be found that，in certain circumstances，radar beacon emissions can cause（）with the normal radar display，particularly at close range.

A.unwanted interference
B.unexpected figures
C.abnormal data
D.unwanted information

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