As 4ztl-1800 combine gain machine fan to incline tongue with straight tongue the influence for fan noise and efficiency study.

对4ztl - 1800联收机风机倾斜蜗舌和直蜗舌对风机噪声及效率的影响进行了实验研究。

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The experiment shows that the noise of the fan with inclining tongue is much lower than the fan with straight tongue, but the efficiency of the fan varies unobviously with the two kinds of tongue.

通过风机倾斜蜗舌降噪的试验和分析表明，倾斜蜗舌较直蜗舌降噪效果明显，同时对效率影响也不大。

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But she stuck out her chin (and a little bit of her tongue too) and went straight towards them.

她冒险伸出下巴颏儿(舌头也伸出了一点儿)，笔直地向坟场走去。

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