We can infer from the end of the passage that______.

A．a poet is usually insightful of and enthusiastic about life

B．Seamus Heaney felt offended by the Stirling student"s question

C．hoeing is a job requiring more physical labor than digging

D．at an old age, Seamus Heaney hoped to contribute more to poetry creation

多个样本均数之间的两两比较需用哪种方法

A.t检验

B.t＇检验

C.方差分析

D.正态性检验

E.q检验

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

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

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