航海英語航路指南單項選擇題每日一練(2019.01.07)

來源：考試資料網(wǎng)

1 Clearance gauges at bridges indicate （）.

2 （）amplify charted detail and contain information needed for safe navigation.

3 Clearances of bridges and overhead cables below Bonneville Dam refer to heights in feet above mean （）.

4 You will find information about the duration of slack water in the （）.

5 During a period of whiteout，you should expect which of the following（）.