The pure quartz shake circuit with a high stable performance to the frequency.

全部采用石英振荡电路，具有极高的频率稳定性能。

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The pure quartz lump becomes quartz tube via untouched technology of intermediate frequency induction heating.

采用中频感应加热无接触技术，将石英净坨拉制成为石英管。

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With rare exceptions such as a pure quartz sandstone, every rock contains detectable amounts of abundant metals.

除了象纯石英砂岩等少数例外，每种岩石都含有若干可检出的富有金属。

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In addition, though, it is doped with powdered quartz (the pure stuff, rather than the tainted variety that makes up most sand) and various reinforcing metals and fibres.

ECONOMIST: Bunker-busting