Such grinding wheel has advantages as high grinding ability and high grinding efficiency, but they are easy to induce scratches on the ground surfaces and hence make bad surface machining quality.
这种高刚度的砂轮具有高的磨削能力和磨削效率，缺点是被磨工件表面易产生划痕，难以获得高的表面加工质量。
Surface condition is very complex in western area, data quality is bad, most western data is low signal to noise ratio seismic data.
西部地区地表情况复杂多样，资料品质较差，多属低信噪比资料。
When insert 3 trunk in 1 hole the artifactitious quality is best, surface quality is become bad along with the trunk is increase.
穴插3株苗左右时加工品质最好，外观品质是随插秧株数的增加而变劣。
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