血液病病人的白细胞数低于下列哪项时需进行保护性隔离 ( )
A1.0×10_TagUpStart_9_TagUpEnd_/L
B1.5×10_TagUpStart_9_TagUpEnd_/L
C2.0×10_TagUpStart_9_TagUpEnd_/L
D2.5 ×10_TagUpStart_9_TagUpEnd_/L
E3.0×10_TagUpStart_9_TagUpEnd_/L
A1.0×10_TagUpStart_9_TagUpEnd_/L
B1.5×10_TagUpStart_9_TagUpEnd_/L
C2.0×10_TagUpStart_9_TagUpEnd_/L
D2.5 ×10_TagUpStart_9_TagUpEnd_/L
E3.0×10_TagUpStart_9_TagUpEnd_/L