A. 10~15; B. 14~20; C. 14~30; D. 10~25。
A. send a requisition list to the supplier B. check that whether the items ordered have been already delivered C. make the chief engineer on sport D. follow a preset procedure
A. 漂移 B. 稳定性 C. 灵敏度 D. 偏移
A. 正确 B. 错误