骨髓穿刺最易发生干抽的疾病是()
A.骨髓增生异常综合征
B.原发性血小板增多症
C.原发性骨髓纤维化症
D.真性红细胞增多症
E.慢性粒细胞白血病
参考答案:C
It's cold outside. You should _______ your coat. [ ]
A. put up
B. put down
C. put on
D. put out
羟基蒽醌的UV吸收峰位和强度受β-OH影响的峰是
A.230nmB.240~260nmC.262~295nmD.305~389nmE.>400nm