flatness measuring instrument

例句：

1. 1. The engineer used a flatnessmeasuring instrument to check the accuracy of themachine.
   工程师使用一个平面测量仪器来检查机器的准确性。
2. 2. The flatness measuring instrumentwas essential for ensuring the quality of thenew car.
   平面测量仪器对于确保新车的质量至关重要。
3. 3. The technician carefully checked the flatness measuring instrument to ensure it was functioning correctly.
   技术员仔细检查了平面测量仪器，以确保它正常工作。