In the A, B, C, D and F grading system, the first four letters are typically considered passing grades.

在 A、B、C、D 和 F 评分体系中，前四个字母通常被认为是及格。

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The system is composed of industrial PC, DMC300 motion controller, discharge status checking card, A/D card, I/O card and pulse power.

该系统由工业 PC，DMC300 运动控制器，放电状态检查卡，A/D 卡，I/O 卡和脉冲电源组成。

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There probably is a risk to having too much vitamin D in the system.

可能会发生系统里存在过多维生素d的风险。

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Other exclusive Nikon technologies include the Active D-Lighting system, which automatically rescues dark or backlit images to help create flattering images with even tones.

ENGADGET: Nikon D3100 gets real, adds 1080p movie mode with continuous autofocus

The D-Wave One system consists of a superconducting 128-qubit chip in a cryogenics system within a 10 square meter room.

FORBES: D-Wave Sells Quantum Computer to Lockheed Martin

This, my friends, is an outdoor picnic with a 3-D stereo system.

NPR: Jazz, Alive and Well and Playing in Monterey