问题 单项选择题

上颌第一磨牙最小的牙尖是哪一个()

A.远中颊尖

B.远中尖

C.远中舌尖

D.第五牙尖

E.近中颊尖

答案

参考答案:C

单项选择题
选择题

如图所示,杠杆处于平衡状态,则F的力臂是

                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               

A.OA

B.OC

C.OD

D.FD