固定桥最理想的固位体是()
A.全冠
B.3/4冠
C.嵌体
D.桩冠
E.以上均是
参考答案:A
解析:全冠为覆盖全部牙冠表面的修复体,其固位力为最佳。
Jackson who was famous for his high energy performances _________ during the Democratic National Committee benefit concert, A Night at the Apollo once.
A.was performed
B.performed
C.performing
D.was performing
机房内各种电缆的金属外皮、设备外壳和不带电的金属部分、各种金属管道等,总接地电阻不大于( )。
A.最长 B.最短 C.最方便 D.最实际