單項(xiàng)選擇題美國(guó)醫(yī)學(xué)物理學(xué)家學(xué)會(huì)(AAPM)規(guī)定加速器E射線的穩(wěn)定性每日監(jiān)測(cè)的允許精度()

A.±1%
B.±2%
C.±3%
D.±4%
E.±5%