closing time shut-off device 关断阀的关闭时间
The allowable shut-off time of fast shut-off valve is calculated by inferred formula and selection way of fast shut-off valve in the gas supply system of gas burning boiler is summarised.
通过推导公式计算快速切断阀的允许切断时间，并总结燃气锅炉供气系统中快速切断阀的选择方法。
The supply of oil can be shut off unexpectedly at any time, and in any case, the oil wells will all run dry in thrty years or so at the present rate of use.
石油供应可能会随时意外中断；不管怎样，以目前这种消费速度，只需30年左右，所有的油井都会枯竭。
Some people have a hard time just sitting. If that's the case, try this: next time you drive alone, shut everything off - phone and radio - and just breathe (with your eyes open, of course).
有些人感到如坐针毡，如果你是如此的话，试一下这个方法：下次你独自开车兜风，关掉所有东西——手机和收音机——仅呼吸(当然要睁着眼睛)。
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