Technical progress of domestic CCR catalyst is expounded.
阐述了我国连续重整催化剂技术的进步状况。
Constant current regulator (CCR) is to provide visual guidance for aircraft taking off and landing.
恒流调光器是为飞机起降提供目视引导的关键设备。
Constant current regulator (CCR) is to provide visual guidance for aircraft taking off and landing.
恒流调光器是为飞机起降提供目视引导的关键设备。
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