A.≤0.60B.≤0.40C.≤0.20D.≤0.10
A.≤0.1/1000B.≤0.2/1000C.≤0.5/1000D.≤0.8/1000
A.指針B.小球最低點(diǎn)C.球中心D.小球最高點(diǎn)