化学计量点的PH值与选择指示剂有什么关系?
参考答案:
选择指示剂的原则是指示剂的变色范围应全部或部分处于突跃范围中,即指示剂的变色点PH值与计量点PH值越接近越好。
____ much we dislike the idea of begging in the street, we should still show consideration
for those who are in difficult situations. [ ]
A. However
B. How
C. Whatever
D. No matter
对于结核性胸膜炎,下列哪项正确()
A.是人体处于高过敏状态时发生的渗出性病变
B.肺内无结核病灶
C.多见于中年人
D.胸膜活检无干酪灶
E.不能加用糖皮质激素