下列哪项是全胃肠外营养的自身并发症（）。 A.气胸 B.血胸 C.纵隔血肿 D.皮下

患者，左下6缺失，设计双端固定桥时，对于固定连接体的要求正确的是

A．应当占据整个邻间隙

B．位于基牙的非接触处

C．面积不能小于4mm²

D．面积不能大于4mm²

E．不必形成正常的唇颊、舌外展隙

We are proud of Li Na who is a Chinese professional 小题1:                player and has won 5 WTA and 19 ITF singles titles. Li won the 2011 French Open singles title, making her the first Asian country representative to win a Grand Slam in singles. With her performance at the 2011 Australian Open, she 小题2:               the first player from an Asian country to appear in a Grand Slam singles final.

Li Na was born 小题3:                February 26, 1982, in Wuhan, Hubei, China. Her father Li Shengpeng was a 小题4:            badminton, following her father’s footsteps. Just before she turned eight, Li started to play tennis when she and her parents were convinced (说服)小题5:            coach Xia Xiyao of the Wuhan Youth Tennis Club that this would be the right career move for her. Li joined China’s National Tennis Team in 1997 and at the end of 2002, Li 小题6:             the national tennis team to study part-time at Huazhong University of Science and Technology,小题7:              she completed her bachelor’s (本科) degree in journalism in 2009. She returned to the national team in 2004. Jiang Shan married Li and became her personal coach in 2006. Li left the national team in 2008 and organized her own team. This change was小题8:               “Fly Alone” by Chinese media. As a result Li had the freedom to pick her own coaching staff and she could keep more of her winnings.

This year, she won the championship in Australia open. How小题9:               we were when we heard of the good news! Congratulations to Li Na!

在三棱锥V-ABC中，当三条侧棱VA、VB、VC满足 ______时，VC⊥AB（填上你认为正确的一种条件即可）．

城市的特色与风貌体现在()

A.社会环境方面和物质方面

B.社会环境方面和经济环境方面

C.经济环境方面和自然环境方面

D.自然环境方面和物质方面

激光再流焊的优点（）。

A、聚光性好，适用于高精度焊接

B、非接触加热

C、用光纤传送能量

D、激光在焊接面上反射率大

E、设备和介质费用低