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【单选题】
磁场中放一个小的载流试验线圈可以确定该点的磁感应强度，其大小等于放在该点处试验线圈所受的___和线圈的___的比值。()A.
磁矩，磁力距
B.
磁力距，磁矩
C.
最大磁力距，磁矩
D.
磁矩，最大磁力距
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【简答题】When my son was first diagnosed with autism （孤独症）, it was a very hard time for us．In some ways it was a 16 _ because we finally knew the name．of the disease after visiting many hospitals, but it also ...
【简答题】Job and Dream My father was foreman of s sugar-cane plantation in Rio piedras, puerto Rico. My first job was to drive the oxen that plowed the cane fields. I would walk behind an ox, guiding him with ...
【单选题】下列各组元素的电负性大小次序正确的是
A.
S < N < O < F
B.
S < O < N< F
C.
Si < Na < Mg < Al
D.
Br < H < Zn
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