【单选题】To keep the Inmarsat-F antenna pointing atthe desired satellite, regardless of the ship's position and course,ithas a(n)____input from the vessel.
【简答题】将下列句子译成汉语,注意句中有些冠词的特殊位置: 1. In this case the current (电流) exists for only half the cycle (周期) . 2. In such a case there is no current flowing in the circuit (电路) . 3. Sensitivity (灵敏度) is a measure of...