写出划线单词在语境中的恰当意义。 1. Losing his job came as a terrible blow to him. 2. The clock has just struck three. 3. The phone had just died and I could not reach anybody.
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参考答案:
举一反三
【单选题】一个负载 R L 经理想变压器接到信号源上,已知信号源的内阻 R 0 = 800 欧姆 ,变压器的变比 k =10 。若该负载折算到原边的阻值正好与 R 0 达到阻抗匹配,则可知负载 R L 为