【单选题】______ that the demand for power continues to rise at the current rate, it will not he long before tradi-tional sources become inadequate.
【判断题】人工呼吸救护人吹气前应先深呼吸一口气,保证有足够的氧气进行救护。
【单选题】加在感抗为 100Ω 的纯电感两端的电压为 V ,则通过它的电流应是
【单选题】He was strong enough to______the heavy box.
【简答题】A.He wants a pay rise. B.He wants better working conditions. C.He wants to get a higher position. D.He wants to travel more in his work.