弹簧心轴是以（）为定位基准面装夹工件的夹具。
A、阶台端面
B、端面
C、外圆
D、内孔
参考答案：D
After his wife was killed in the earthquake, it was his daughter _____ managed the house and accompanied him
A．whom
B．that
C．which
D．what
某招标人在招标文件中规定了对本地区的投标人在同等条件下将优先于其他地区的投标人中标，根据《招标投标法》，这个规定违反了 原则。
A．自由
B．公平
C．公正
D．诚实信用
