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【单选题】
When crossing the magnetic equator the ______．A.
Flinders bar should be inverted
B.
Heeling magnet should be inverted
C.
The quadrantal spheres should be rotated 180°
D.
Flinders bar should be moved to the opposite side of the binnacle
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举一反三
【单选题】_ __is a radar transponder which emits a characteristic signal when triggered by a ship’s radar.
A.
Clutter
B.
Radar reflector
C.
Remark
D.
Racon
【简答题】母亲妊娠期间严重缺碘,对胎儿发育影响最大的是A. 中枢神经系统
【单选题】The radar control that reduces weak echoes out to a limited distance from the ship is the ____ __.
A.
sensitivity time control（sea-clutter control）
B.
receiver gain control
【单选题】Radar beacons are transmitters designed to produce a ___ on the screens of ship’s radar sets.
A.
incorrect image
B.
distinctive image
C.
pictorial image
D.
pictographic image
【简答题】简述教学方法的类型。
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