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单词 Plumb bob
例句
(1) A plumb bob is useful to check the alignment of the header with the sill.
(2) If the mass in question is a plumb bob, the horizontal component of F is important.
(3) The magnetic surveying instrument uses a magnetic compass card , plumb bob, and modified movie camera that is activated by a timer.
(4) If you have a good eyeball you can do it that way or use a plumb bob .
(5) The gyroscopic surveying instrument uses a gyroscope, compass card, plumb bob, and modified movie camera.
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更新时间:2025/3/14 18:20:09