双侧颏孔区骨折，两侧后骨折段向（）移位，前骨折段则向（移位，引起颏部（）及舌（）。
参考答案：上前方；下后方；后缩；后坠
—What do you think of the performance today?
—Great! but a musical genius could perform so successfully.
A．All
B．None
C．Anybody
D．Everybody
围生期的定义是指
A．自妊娠20周至产后7天B．自妊娠28周末至产后7天C．自妊娠28周至产后4周D．自妊娠37周至产后7天E．自妊娠38周至产后2周
