航海英語航海儀器使用說明書單項(xiàng)選擇題每日一練(2019.01.18)

來源：考試資料網(wǎng)

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

2 A Doppler log in the volume reverberation mode indicates（）.

3 The radar component that produces the synchronizing signal and triggers the indicator sweep is which of the following?（）.

4 The radar component that generates the radio-frequency energy in the form of short powerful pulses is which of the following?（）.

5 Error may be introduced into a magnetic compass by（）.