A. Full ahead! B. Slow astern! C. Half astern! D. Dead astern!
A.回到5！ B.回到10！ C.舵反转！ D.压舵！
A. They work four hours and have four hours for rest. B. They work eight hours and have four hours for rest. C. They work four hours and have eight hours for rest. D. They work eight hours and have eight hours for rest.
A.thrust B.stern C.engine D.speed
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