输出功率相同的两台电动机,极数多的与极数少的相比,电动机的转矩()。
A.极数多的转矩大
B.极数少的转矩大
C.相同
参考答案:A
Direction:For this part,you have to write a short passage on the topic:Volunteer Teaching in the West.You should write at least 150 words following the outline given below in Chinese: 1.每年,高校许多大学生受到鼓舞去贫困地区支教; 2.支教活动的意义; 3.你的看法。
B细胞成熟的标志:()
A.IgM
B.IgG
C.IgA
D.IgD
E.IgE