保证血液安全的前提和基础是
A．无偿献血B．血液检测C．成分输血D．自身输血E．避免不必要的输血
参考答案：B
-Can students eat in the library?
- [ ]
A. Yes, they can't
B. No, they don't
C. Yes, they do
D. No, they can't
下列哪项是肾炎性肾病的特点（）
A.全身浮肿，血白蛋白降低，补体正常
B.血尿，高血压，血补体降低
C.血中丙种球蛋白增高，血沉正常，补体降低
D.血胆固醇增高，血沉加快，补体增多
E.显著浮肿，持续高血压，进行性贫血
