一个完整意义上的统计指标由时间、地点、指标名称、（）、计量单位
参考答案：指标数值
Many kinds of books, newspapers and magazines _____ in this library.[ ]
A. are kept
B. is being kept
C. are keeping
D. have kept
A．副线圈中电压表的读数为55V
B．副线圈中输出交流电的周期为0.01s
C．原线圈中电流表的读数为0.5A
D．原线圈中的输入功率为110W
W