咬合干扰表现为()
A.前伸干扰
B.非干扰侧干扰
C.ICP干扰
D.工作侧干扰
E.后退干扰
参考答案：A, B
人类血液干细胞首先见于（）
A．胚外的卵黄囊血岛
B．胚外尿囊底部
C．主动脉旁胚脏壁
D．主动脉一性腺一中肾区
E．肝脏
Bears fat stores throughout the summer and fall to have energy enough to last them through their winter sleep.
A．pack up
B．build up
C．bring up
D．take up
