根据测量方法的不同，常用的硬度指标有()
A.布氏硬度
B.洛氏硬度
C.维氏硬度
此题为多项选择题。请帮忙给出正确答案和分析，谢谢！
胸骨左缘第3～4肋间闻及Ⅲ～Ⅴ级粗糙的全收缩期杂音，肺动脉第二音亢进
A.房间隔缺损
B.室间隔缺损
C.动脉导管未闭
D.肺动脉狭窄
E.法洛四联症
与B7结合抑制T细胞活化的是
A、CD2
B、CD40L
C、ICOS
D、CTIA-4
E、CD28
预防破伤风用
A、丙种球蛋白
B、类毒素或抗毒素
C、活疫苗
D、化学药品
E、灭活疫苗
During the medieval times, if one man covered in armor extended an open hand to another, ______.
A．the same gesture would definitely be returned
B．he was sending a signal of friendship
C．he would receive a dagger or sword
D．he was asking for a weapon