配衡离子
参考答案：颗粒表面带电后，吸引溶液中的反号离子，即双电层外层吸附的反号离子。
下列哪项是全胃肠外营养的自身并发症（）。
A.气胸
B.血胸
C.纵隔血肿
D.皮下血肿
E.肝酶谱升高
---You have tried on several shirts.
---Sorry to take up too much of your time. But __________ of them look good on me.
A．neither
B．any
C．none
D．both
