在多次重复测量同一量值时，系统误差不具有（），它是固定的或服从一定函数规律的误差。
A、对称性
B、抵偿性
C、单峰性
D、有界性
参考答案：B
被病人用过的棉球、棉签、引流棉条、纱布是（）
A、感染性废物
B、病理性废物
It is required in the regulations that any student _____ fighting with students who come from other schools
should be dismissed. [ ]
A. dealt with
B. referred to
C. related with
D. involved in
