单选题 Between April and November, squalls ( ) as Sumateras 苏门答腊风飑 ( ) in Malacca Strait in The late afternoon or overnight and ( ) E to affect the W coast of Malaysia and Singapore Island.

A、 known, developing, move
B、 known, developed, move
C、 known, develop, moving
D、 known, develop, move
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单选题 What is in the center of the compass card?

A、 the magnetic needle
B、 Compass card
C、 The float
D、 Mk magnetic steel

单选题 Where can a mariner find the variation of a given locality?

A、 In the title legend of a chart
B、 In the notices to mariners
C、 In the sailing direction
D、 On the compass rose of the chart

单选题 Which one of the following is NOT correct according to the passage?

A、 Even in the same locality variation usually does not remain constant, but increases and decreases at a certain rate annually.
B、 Variation changes with ship’s heading
C、 if the annual variation is an increase, you add; if it is a decrease, you subtract
D、 the amount the needle is offset is called variation because the amount varies at different points on Earth’s surface

单选题 Which is not included in compass bowl?

A、 Nonmagnetic material
B、 Magnetic elements
C、 Reference marks
D、 Fluid

单选题 If the ship is only affected by variation, the magnetic compass will ( )

A、 point steadily in the general direction of the magnetic north pole
B、 point steadily in the general direction of the magnetic north pole if the ship remains a steady heading
C、 have an error larger than the variation
D、 point to a different direction as the ship’s heading changes

单选题 Which of following is one of oldest navigational aids?

A、 gyro compass
B、 Magnetic compass
C、 Earth’s magnetic
D、 Electrical power

单选题 Which is not the reason that there are still magnetic compasses on board despite the rising importance of the gyrocompass?

A、 The magnetic compasses are simplicity and reliability
B、 The magnetic compasses can still be used when electrical power failure
C、 The magnetic compasses are more accurate than gyrocompasses
D、 After collision or grounding, the magnetic compass is still operational

单选题 Which of the following is the main cause of ship’s variation?

A、 Changing of ship’s heading
B、 changing of ship’s magnetism
C、 magnetism of the earth
D、 changing of ship’s deviation