航海英语GPS、DF及LC的使用单项选择题每日一练(2019.01.24)

单项选择题
If several fixed navigational lights are visible at the same time，each one may be positively identified by checking all of the following EXCEPT what against the Light List?（）
A.Rhythm
B.Period
C.Intensity
D.Color
单项选择题
While you are at anchor，what will serve as a positive warning that you are drifting towards the wrecks located to the NW and SW of your 2215 position（）.
A.A decreasing reading on loran pair 9960-X
B.The bearing of Wolf Trap Light changing to the right
C.Increasing soundings
D.The bearing of Wolf Trap Light changing to the left
单项选择题
Loran-C uses the multiple pulse system because（）.
A.Less signal energy is necessary for receiver operation
B.More signal energy is available at the receiver
C.It significantly increases the peak power
D.It increases the signal capacity
单项选择题
How is variation indicated on a small-scale nautical chart?（）
A.Magnetic compass table
B.Magnetic meridians
C.Isogonic lines
D.Variation is not indicated on small-scale nautical charts
单项选择题
At sea，we can use（）to fix the ship’s position.
A.VHF
B.Steering Gear
C.Rudder Indicator
D.Loran