depth indicator（）
第1题：
I hereby ______ that my vessel is fitted with a rudder angle indicator and an engine revolution indicator on the bridge in such a position that the pilot may read both without having to move away from his station； and that the rudder angle indicator and engine revolution indicator are in good working condition.
A.delay
B.state
C.delete
D.contain
第2题：
A channel is started as having a controlling depth of 38 feet. Which statement is TRUE?_____
A.At least 80% of the channel is cleared to the charted depth.
B.At least 50% of the channel is cleared to the charted depth.
C.100% of the channel depth is clear to 38 feet.
D.The sides of the channel conform to at least 50% of the controlling depth.
第3题：
Before entering a fuel tank that has been cleaned, it should be checked with an oxygen indicator and a/an ____.
A.Orsat apparatus
B.flame safety lamp
C.Halide torch
D.combustible gas indicator
第4题：
（）(富余水深) is the depth remaining under a ship’s bottom.
第5题：
指标（indicator）
第6题：
All echo-sounders can measure the ______．
A.Actual depth of water
B.Actual depth of water below keel
C.Average depth from waterline to hard bottom
D.Average depth of water to soft bottom
第7题：
精密进近航道指示器。（）
第8题：
The height of tide is the ______.
A.depth of water at a specific time due to tidal effect
B.difference between the depth of the water and the area's tidal datum
C.difference between the depth of the water and the high water tidal level
D.difference between the depth of the water at high tide and the depth of the water at low tide
第9题：
Which statement is FALSE concerning the interleave depth value？（）
第10题：
纵深防御 defence in depth