航海英語航海儀器使用說明書單項(xiàng)選擇題每日一練(2019.01.10)

來源：考試資料網(wǎng)

1 If（）is shut down for an extended time optimum position fixing will take up to 2 hours after power is reapplied．

2 A Doppler speed log indicates speed over ground（）.

3 A radar contact will remain stationary on a relative motion radar display only when it is（）.

4 The microsecond unit of time is used in radar applications. The microsecond represents which of the following?（）.

5 The number of pulses of energy transmitted per second is call the（）.