如果数控机床安装环境不佳，会造成（）技术性能下降，电器接触不良或短路故障。 A.数控

That social institutions influence the formation of character has become a generally accepted proposition. This doctrine views individuals as but compliant recipients of social influence: personalities are entirely the products of society, and at any point in life an individual’s personality can be changed by management of the social world. Crime is said to exist only because society has in some ways failed in its responsibility to give every person the resources to lead a productive life. However, whereas it is tree that extreme poverty forces some people to steal, it is obvious that some persons will commit crimes no matter how well society treats them.
Which of the following is implied by the "doctrine" (line 2) described in the passage above

A．Social institutions may reflect personality as much as they shape it.

B．Social influence on personality is most ply felt by the affluent.

C．The concentration of wealth in the hands of a privileged few accounts for the existence of crime.

D．Bringing about social reform is the most likely means of curtailing crime.

E．(E) Less severe punishment of crime would be likely to result in more crime.

2007年lO月24日，我国成功发射了“嫦娥一号”探月卫星，火箭发射用到了加注的低温液态氢和液态氧，液态氢燃烧时产生的巨大推动力将“嫦娥“送人太空．请回答下列问题：（相对原子质量：H一10-16）

（1）写出液态氢燃烧的化学方程式______，若低温液态氢和液态氧的总质量为36吨，则需加注液态氢______吨．

（2）液态氢作燃料除了燃烧时产生较大的推动力之外，另一个优点是______．

饮料中的果味大多来自酯类丁酸乙酯(C₆H₁₂O₂)是无色具有菠萝香味的液体，常用作食品、   饮料的调香剂。下列叙述中，正确的是

A．丁酸乙酯是由20个原子构成的

B．丁酸乙酯的相对分子质量为116g

C．丁酸乙酯中碳、氢、氧元素的质量比为18：3：8

D．一个丁酸乙酯分子中碳、氢、氧原子的个数比为3：6：2

1岁小孩，发热15天，咳嗽伴轻度喘憋，查体：浅表淋巴结有轻度肿大，双肺未闻及啰音，此患儿已接种卡介苗， PPD试验(＋＋＋)。首选的检查是

A．血气分析

B．心电图

C．淋巴结活检

D．胸部CT检查

E．胸部X线检查

中国古代儒家所宣传的“大同”社会理想反映了（）。

A.封建社会的一般特征

B.资本主义社会的一般特征

C.理想化的传说中尧舜时代原始公有制社会的一些特征

D.阶级社会形成后的一般特征