球管是CT中最昂贵的消耗性核心部件。本文简析了球管的一般常见故障，以及对非致命故障的排除方法。
The tube is the most expensive and consumable part of in spiral CT. This article analysis usual problems, and introduces some preventive maintenance method.
重试的最大数目：RFT重垄断一个非致命讹谬引起的故障的传输的次数。
Maximum number of retries: This is number of times RFT retries a transfer failed with a non-fatal error.
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