下列几种真空装置中，（）产生的真空度最易受季节影响。
A. 蒸汽喷射泵
B. 水力喷射泵
C. 干式真空泵
D. 水环真空泵
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The greatest effect on stability occurs from loose liquids flowing（）.
A. from side to side in the tanks of the vessel
B. from fore to aft in the tanks of a vessel
C. in and out of a vessel that is holed in a wing tank
D. in and out of a vessel that is holed in a peak tank
每日总部以（）、（）两种方式发布全网监控大值班日报。
几何光学三个基本定律是：直线传播定律，反射定律，（）
什么叫产业带？试述“点—轴—带”开发模式的基本原理。
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