电疗法基础知识中,"呈现有规律的脉冲波组的减幅振荡电流"属于()
A.静电
B.传导电流
C.位移电流
D.介电常数
E.脉冲减幅振荡电流
参考答案:E
25×4×7与25×______的积相等,它们的积是______位数,末尾有______个0.
How ____________ books can you see? [ ]
A. much
B. many
C. old
D. far