second throat

In this paper, the Mach number control system in NF-6 wind tunnel is introduced, especially in detail for the compressor rotary speed control sub-system, the compressor stator vane control sub-system and the second throat control sub-system. angle.

笔者介绍了NF6风洞马赫数控制系统的组成、特点及运行方式，对转速控制子系统、压缩机静叶角控制子系统、二喉道栅指控制子系统等进行了较为详细的介绍。

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Bacterial culture of throat swab of 20 cases of the first time and 17 cases of the second time were carried out. The positive rate of β hemolytic streptococcus was 82.5% and 85.3% respectively.

第1次中20人及第2次中17人做了咽拭子细菌培养及血清学分组，结果分别有82.5%及85.3%培养出A组β-溶血性链球菌。

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He jumped onto a second ， then a third man ， going each time for the throat.

然后他又扑向第二个人，然后又是第三个人，每一次都瞄准咽喉。

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