题目

从方框中选出下列各句的最佳应答语。 A. Thank you. B. Great! C. I'm seven years old. D. Nice to meet you. E. Three. (1) How old are you? (2) How many books? (3) Happy birthday! (4) Let's eat the bread! (5) This is my brother. 答案:C E A B D甲、乙、丙三根用相同材料制成的均匀合金丝,甲、乙的粗细相同,但甲较长;乙、丙的长度相同,但丙较粗,则这三根电阻丝的电阻值最大的是_______,最小的是___________.
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