皮下组织含有（）
A.基底膜带
B.汗腺
C.朗格汉斯细胞
D.神经
参考答案：B, D
Because of ill health, she has been obliged to _____ her job. [ ]
A. resign
B. depart
C. retire
D. dismiss
对于长期肠外营养支持的患者不适合的静脉是()
A．颈内静脉
B．颈外静脉
C．大隐静脉
D．股静脉
E．锁骨下静脉
