下列焊接方法中，属于熔化焊接方法的是( )
A．钎焊 B．电阻焊C．摩擦焊 D．埋弧焊
参考答案：D
Most of the host operating system provides a way for a system administrator to manually configure the IP information needed by a host．Automated configuration methods, such as (72) , are required to solve the problem．
A．IPsec
B．DHCP
C．PPTP
D．SOAP
工件的夹紧方法应根据工件的（）来决定。
A.结构形状
B.尺寸大小
C.质量大小
D.材质特点
E.表面硬度
F.加工方法
