凡用测量客观条件不能解释为合理的那些突出的误差就是______。
A．系统误差 B．人员误差 C．粗大误差 D．随机误差
参考答案：C
正常胆囊壁的厚度为（）
A.>1mm
B.>2mm
C.>3mm
D.>4mm
E.>5mm
Consumption of the total life-cycle effort in software maintenance is ______ that in software development.
A．less than
B．larger than
C．equal Or less than
D．equal or larger than
