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【单选题】
The author implies that ______.A.
the teacher should guide all discussions by revealing her own attitude
B.
children’s attitudes often come from those of other children
C.
in some aspects of social studies a greater variety of methods can be used in the upper grades than in the lower grades
D.
schools should offer the student opportunities for travel so that he can come into contact with people he would not otherwise meet
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【简答题】在图1所示电路中,当开关S闭合时,A点电位V A = ,U AB = ;当开关S断开时,A点电位V A = ,U AB = 。
【简答题】工程总费用由直接费和间接费两部分组成，随着工期的缩短，会引起（ ）。
【简答题】在图3-30所示电路中,当开关S断开时,A点的电位VA= ;当开关S闭合时,A点的电位VA= 。
【简答题】安培环路定理表明磁场 保守场(填“是”或“不是”)。
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