(1+x)7的展开式中x2的系数是[ ]
A.42
B.35
C.28
D.21
答案:D
病历摘要:患者,男性43岁,主因左眼睑下垂一周入院。X线胸部正侧位片显示前上纵隔6×6cm肿物,边界清楚。
纵隔肿瘤的临床表现表现包括:()
A.胸痛、胸闷
B.声音嘶哑
C.吞咽困难
D.呼吸困难
E.Horner氏综合症
_________ be sent to work there?
A.Who do you suggest
B.Who do you suggest that should
C.Do you suggest who should
D.Do you suggest whom should