航海英語雷達(dá)及ARPA的使用單項(xiàng)選擇題每日一練(2019.01.17)

來源：考試資料網(wǎng)

1 The radar control that shortens all echoes on the display and reduces clutter caused by rain or snow is the（）.

2 Which condition indicates that your radar needs maintenance?（）

3 When using a radar in a unstabilized mode，fixes are determined most easily from（）.

4 When will the float-free emergency position indicating radiobeacon be activated after abandoning ship? （）

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