When the writer left the marketplace, she wanted to cry, but did not because ______.
A.she had learned to stay cool and unfeeling
B.she was afraid of crying in public
C.she had learned to face difficulties bravely
D.she had to show in public that she was strong
第3题
形象地表示磁场的强弱方向和分布情况的曲线叫()。
A.磁场强度
B.磁场梯度
C.磁力线
D.磁通量
第9题
A.每一根磁力线都是闭合的曲线
B. 任两根磁力线都不能交叉
C. 磁力线的长短反映了磁场的强弱
D. 任一根磁力线上的任一点的切线方向即为该点的磁场方向
第10题
A.每一根磁力线都是闭合的曲线
B.任两根磁力线都不能交叉
C.磁力线的长短反映了磁场的强弱
D.任一根磁力线上的任一点的切线方向即为该点的磁场方向
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