功率因数是有功功率与视在功率的比值。
参考答案：对
图甲所示的电流表的分度值为______A．图甲中的读数是______A．图乙所示的电压表的分度值为______V．图乙中的读数是______V．
I have lost one of my gloves. I ________ it somewhere.[ ]
A. must drop
B. must have dropped
C. must be dropping
D. must have been dropped
