免疫组化染色中最常用的、能够较完好地保存抗原免疫活性的切片方法
A．冰冻切片B．石蜡切片C．振动切片D．塑料切片E．直接涂片
参考答案：A
Your composition is well-written ______ a minor spelling mistake.
A．beside
B．besides
C．except that
D．except for
请简述WLAN网络干扰的本质。
