由于凝血因子异常导致的出血性疾病是
A．过敏性紫癜B．遗传性纤溶亢进C．获得性纤溶亢进D．单纯性紫癜E．乙型血友病
参考答案：E
We mustn't take _____. We'd better play _____. [ ]
A. chance; safe
B. chances; safe
C. a chance; safety
D. a chance; safely
为满足一般化学分析的要求，25℃时，纯水的电导率为（）ms/m。
A.≤0.50
B.0.50-1.0
C.1.0-2.0
D.2.0-5.0
