defocusing of beam

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1.	注束去焦 55???? ... 去焦（点）效应 defocusing effect 注束（之）去焦 defocusing of beam 形变 deformation ... www.docstoc.com
2.	注束之去焦 "D半... ... "defocusing effect " 散焦效应" "defocusing of beam " 注束之去焦" "De-Forest coil " 蜂巢线圈,蜂房式线圈" ... www.wendang365.cn

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