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
接触评定的主要目的是
A、估测总体人群或不同亚群接触该有害因素的程度或可能程度
B、估测总体人群接触某种有害因素对健康的影响程度
C、估测总体人群或不同亚群接触有害因素的程度
D、估测总体人群或不同亚群接触有害因素的程度及对健康的影响
E、估测总体人群接触有害因素的程度及对健康的影响
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！
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
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
Which of the following can best serve as the title of the passage？
A．A Possible Approach to Checking Heart Disease
B．The Risk of Heart Disease
C．The Relation Between Weight and Blood Pressure
D．How to Improve Your Heart Health