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以下关于钉洞固位形的说法中错误的是()

A. 钉固位力的大小主要取决于钉洞深度
B. 固位钉的直径约为1mm
C. 固位钉可分为粘固式、螺纹式、楔入式
D. 楔入式固位力最好
E. 钉洞应位于坚固的牙本质上

血压计属于()仪器设备。

维生素D缺乏性手足搐搦症的主要表现是()

A. 惊厥
B. 昏迷
C. 手足徐动
D. 高热
E. 肌阵挛

Which two encapsulation methods require that an 827 ADSL router be configured with a PPPusername and CHAP password?()

A. PPPoE with the 827 configured as a bridge
B. PPPoE with the 827 configured as the PPPoE client
C. PPPoA
D. RFC 1483 Bridged with the 827 configured as the PPPoE client
E. RFC 1482 Bridged with the 827 configured as a bridge

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