欧洲股市周一开盘走高，受到美国非农就业人数增加的提振，延续前一交易日涨势，公用事业和银行个股涨幅居前。
LONDON (MarketWatch) — European stock markets moved higher Monday, adding to payrolls-inspired gains from the previous session, with utilities and banking stocks among the strongest risers.
根据几何光学原理，推导出转镜-振镜扫描系统物镜前振镜上光斑移动速度的解析表达式。
An analytical expression for spot moving speed on the former vibrating mirror of the polygonal mirror scanning system objective is derived from geometrical optical principle.
后掠会增加效率，但是会降低喘振裕度，而前掠有相反的趋势。
Backsweep can improve the efficiency at the expense of surge margin.
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