影响自感电动势大小的因素，其中错误的有（）
A.电流变化的快慢
B.电压的大小
C.线圈结构
D.线圈周围介质
参考答案：B
______ advertisement uses ______ words and pictures the advertisers think of to convince people to buy ______ product or________ service, or to believe in an idea.
A．An; the; a; /
B．An; /; the; a
C．The; /; a; /
D．The; the; /; the
试述小儿泌尿系统的解剖特点。
