当白细胞降至多少时应处理

• A.3×10<img src="http://timg.fentiku.com/278/2017/3/7/IKB5Z1s1h6.png" title='IKB5Z1s1h6.png' alt='IKB5Z1s1h6.png'/>／L
• B.4×10<img src="http://timg.fentiku.com/278/2017/3/7/Wp7O8b5snu.png" title='Wp7O8b5snu.png' alt='Wp7O8b5snu.png'/>／L
• C.3×10<img src="http://timg.fentiku.com/278/2017/3/7/xNhXcc8LDA.png" title='xNhXcc8LDA.png' alt='xNhXcc8LDA.png'/>／L
• D.4×10<img src="http://timg.fentiku.com/278/2017/3/7/aNkoZxZuyV.png" title='aNkoZxZuyV.png' alt='aNkoZxZuyV.png'/>／L
• E.5×10<img src="http://timg.fentiku.com/278/2017/3/7/Ftuo1tphnC.png" title='Ftuo1tphnC.png' alt='Ftuo1tphnC.png'/>／L

正确答案：A