航海英語雷達(dá)及ARPA的使用單項(xiàng)選擇題每日一練(2019.01.21)

來源：考試資料網(wǎng)

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

2 What provides little or no indication that a vessel is dragging anchor? （）

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

4 The ARPA may swap targets when automatically tracking if two targets（）.

5 The 10-cm radar as compared to a 3-cm radar of similar specifications will（）.