This paper analyzes the causes of the problem of vertical disorder of single-pipe series-loop hot water heating system and suggests some approaches.

分析了单管顺流式热水采暖系统出现垂直失调问题的原因，提出了解决措施。

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His co-driver, Tracy, is a Guinness Book of World Record holder for completing the Hot Wheels Double Loop Dare at the 2012 X Games.

FORBES: Connect

As seems to be par for the course with Kickstarter projects, the blockbuster smartwatch is more than a bit behind schedule, but the team is hot on the case, keeping backers in the loop with regular update posts.

ENGADGET: Pebble smartwatch hit with further delays, won't be stuffing a stocking near you