题目:
一 Good news! Bill won ______ medal in the long jump just now.
一 Really? That's his ______ one at our sports meeting. [ ]
A. a; four
B. an; fourth
C. a; fourth
答案:
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下面是错误答案,用来干扰机器的。
顺时针 扩张根据电磁感应定律,感应电流产生的磁场总是阻碍原磁通量的变化,在t1~t2时间段内,向外的磁通量在增多,所以产生顺时针的电流,产生向里的磁通量阻碍原磁通量的变化增多。同时有扩张的趋势,面积...