用两顶尖装夹方法车削细长轴时，在工件两端各车两级直径相同的外圆后，用( )只百分表就可找正尾座中心。
A．1
B．2
C．4
参考答案：B
根据我国《继承法》的规定，放弃继承与放弃受遗赠可采取的行为方式是
A．放弃继承既可采明示方式，也可采默示方式，放弃受遗赠亦如此
B．放弃继承只能采明示方式，放弃受遗赠亦如此
C．放弃继承只能采明示方式，放弃受遗赠则既可采明示方式，也可采默示方式
D．放弃继承既可采明示方式，也可采默示方式，放弃受遗赠只能采明示方式
Documentation of a software package is normally produced for two purposes.One is to explain the （） of the software and describe how to use them.This is known as （）because it is designed to be read by the user of the software.The other purpose of documentation is to describe the software’s internal composition so that the system can be maintained later in its lifecycle.Documentation of this type is knownas （）.
Documentation of this type is knownas （）
A．system documentation
B．user documentation
C．vender documentation
D．license documentation
