B淋巴细胞分化、成熟的场所（）
A.骨髓
B.胸腺
C.淋巴结
D.脾
E.黏膜相关淋巴结组织
参考答案：A
下列防水卷材中，特别适用于寒冷地区或变形较大的土木建筑防水工程的是( )。
A．三元乙丙橡胶防水卷材B．聚氯乙烯防水卷材C．氯化聚乙烯防水卷材D．氯化聚乙烯-橡胶共混型防水卷材
A client with bicuspid aortic valve has severe stenosis and is scheduled for valve replacement. While teaching the client about his condition and upcoming surgery, the nurse shows him a heart illustration. Which valve will be replaced （）
A. A
B. B
C. C
D. D
