The operating principle of three--vane external circulating current piston pump was studied and the conditions of liquid seal and non--interferrence of the pump were got.

通过对三叶外环流活塞泵工作原理的研究，得出了它的封液条件和不干涉条件，并给出了设计方法和有关公式。

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Fitch said Nokia needs to stabilize revenues and be capable of generating low-single digit non-IFRS operating profit margins and positive pre-dividend free cash flow, if it is to affirm the current rating.

FORBES: Nokia Debt Rating Downgraded To Junk Status Buy Fitch

Given the current level of visibility, we believe targeting a non-GAAP operating margin of 8%-9% by the end of 2012 is realistic.

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