第一个在实验中发现电流周围存在磁场的科学家是 ____.托里拆利实验首先测定了 ____的值
多音字组词
旋 xuán____xuàn____ 转zhuǎn____ zhuàn____ 著zhù____ zhuó____
—Peter's father is a _______ math teacher. —I think so. He teaches _______.
He isn't such a man ______ he used to be.