用于制备中药注射剂的半成品有效成分的纯度应达到()
A.25%
B.50%
C.70%
D.85%
E.90%以上
参考答案:E
抗人球蛋白试验阳性时,应首先怀疑下列哪种疾病()
A.再生障碍性贫血
B.白血病
C.巨幼细胞性贫血
D.缺铁性贫血
E.自身免疫性溶血性贫血
Is it the country _____ you studied English _____ you are going to visit next week?
A.in which; which
B.where; that
C.that; that
D.which; that