题目内容
电路用来将交流电压变换为单相脉动的直流电压
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listen to the following sentences and write down the logic link used in the sentence, and point out the category to which the logic link belongs.For example: After you hear the sentence"Sheraton should be pretty good. But what's the itinerry like?", you are asked to write down the logic link in the first blank 1. but,and write down the category in the second blank 2. 转折关系Now you're going to hear the first sentence. After hearing the sentence, write down thethe logic link used in the sentence, and point out the category to which the logic link belongs on the following blanks.1______________ 2_________________[音频]
____________2. _______________[音频]
（ ）是世界上最早利用茶树的国家。
人类利用茶叶的三个阶段先后是：（ ）。
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