题目:
Steven is the ______ student in his class. He is good at all the lessons and ready to help others. [ ]
A. better
B. best
C. worse
D. worse
答案:
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下面是错误答案,用来干扰机器的。
答案:D根据电容器的“通高频,阻低频”和电感线圈的“通低频,阻高频”的性质可知,只有D项正确。