井下测角的仪器误差来源于两方面：仪器检校不完善而引起的误差、（）所引起的误差。
参考答案：仪器加工不完善
He is a ______ and he is on our school ______ team. [ ]
A. running; runner
B. runner; running
C. runs; running
高压煤浆泵动力端润滑部位有些？
