38. 施放錨鏈時，錨鏈的長度使錨鏈與海底約成10度之水平角，則此時錨之抓著力約為其最大抓著力之百分之幾? (A)80 (B)60 (C)40 (D)30

43. 某船在北緯，設其緯度L；若該船向南航駛d浬，又向西航駛d浬，再向北航駛d浬，又向東航駛d浬，並假設此船未跨過赤道；則請問出發點至到達點間的經度差為下列何者？ (A)d [sec L- sec (L- d)] E (B)d [sec L- sec (L- d)] W (C)d [sec L- sec (L+ d)] E (D)d [sec L- sec (L+ d)] W