... holding of subsidiary's prefered and common stock 对子公司优先股及普通股控制 holding vacuum pump 维持真空泵 holdup 滞留量 ...
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Adopting zircon pump as inspiration pump, a static state simulation equipment was designed for vacuum holding.
采用锆泵作为吸气泵，设计出静态保真空模拟实验装置。
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