这台电压表/伏特计如此灵敏，可以测量出电压的微小变化。This is such sensitive voltmeter that it can measure the slightest changes in voltage. A the

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这台电压表/伏特计如此灵敏，可以测量出电压的微小变化。This is such sensitive voltmeter that it can measure the slightest changes in voltage. A the B a C an D / 答案 a读者学会这些基本概念很重要，否则后面内容的讨论理解起来会有困难。It is important for the reader to learn the basic concepts well, the discussion of later topics will be difficult to understand.