What is a proper topic when you are talking with an American ?
A. salary
B. marital status
C. hobby
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What is a proper response of the following to “Thank you. ” ?
A. Don’t mention it.
B. It doesn’t matter at all
C. It is my duty to do so.
American parents would ask their children’s opinion in family decision-making because_______
American children have much power in the family.
B. American parents take their children as an equal.
C. American parents are unable to make decisions themselves.
由能斯特方程可知，能斯特电位（膜电位）的绝对值
A. 随着膜两侧离子浓度差的增大非正比增大
B. 随着膜两侧离子浓度差的增大正比增大
C. 随着膜两侧离子浓度差的增大非反比减小
D. 随着膜两侧离子浓度差的增大反比减小
对导线而言，电流密度的大小就是（导线）单位截面面积的电流强度，也就是单位时间内，通过（导线）单位截面面积的电量。
A. 对
B. 错
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