单纯性二尖瓣狭窄的病变不伴有A．左心房肥厚 B．左心房扩张 C．右心室肥厚 D．左心

水准仪构成部件不包括( )。

A．望远镜

B．水准器

C．水平度盘

D．基座

南极考察需有专门的船舶承担航渡任务。我国的哪些考察船为我国南极考察事业作出了非常重要的贡献？

采区中部车场基本形式有（）、（）、（）三类。

Beauty has always been regarded as something (36) . Almost everyone thinks attractive people are happier and healthier, have better marriages and have more (37) occupations. Personal (38) give them better advice for finding jobs. Even judges are softer on attractive (39) . But in the executive circle, beauty can become a (40) . While attractiveness is a positive factor for a man on his way up the executive (41) , it is harmful to a woman. Handsome male executives were (42) as having more integrity than plainer men; effort and ability were thought to (43) for their success. Attractive female executives were considered to have less integrity than unattractive ones; their success was attributed not to ability but to factors such as luck. All unattractive women executives were thought to have more integrity and to be more capable than the attractive female executives. Interestingly, though, (44) . Why are attractive women not thought to be able.’ An attractive woman is perceived to be more feminine and an attractive man more masculine than the less attractive ones. (45) . This is true even in polities. A study was made on the attractiveness of political candidates. (46) .

焊后立即采取消氢处理的目的是（）。

A、防止氢气孔

B、防止热裂纹

C、防止冷裂纹

D、再热裂纹