车削多阶台工件时，如果轴向长度尺寸的（）找得不正确，将会造成（）误差而产生废品。
参考答案：基准；累积
The little girl ,but her family was too poor at that time.
A．could go to school
B．could have gone to school
C．must have gone to school
D．can have gone to school
外观检验时以下哪一项是合格项。（）
A、车辆后部号牌安装在右后部位
B、同轴轮胎花纹不一样
C、倒车灯不亮
D、车体外缘左右不对称但高度差为30mm
