6. Which of the followings is driven by electricity and it point to
the true north for indicating the direction?
(A) Radar.
(B) GPS.
(C) Gyro compass.
(D) Magnetic compass.
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統計: A(3), B(4), C(30), D(2), E(0) #1330983
統計: A(3), B(4), C(30), D(2), E(0) #1330983