误差按产生原因及按性质可分为理论误差、仪器误差、人为误差、错误、环境引发误差等五类。按性质可分为系统误差，偶然误差两大类。（）
参考答案：对
—____ she got a nice dress?
—Yes, she _____. [ ]
A. has, does;
B. Does; Does
C. Has; has
D. Does; has
透平油在设备中的作用仅起润滑作用
