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The American mezzo Catherine Keen

美国女中音凯瑟琳·基恩

The corrosion rate adjoined to lower limit of serious corrosion and upper limit of mezzo corrosion at 170 ℃ .

在170℃下，其腐蚀速率靠近严重腐蚀的下限，接近中度腐蚀的上限。

It is showed that the virtue of the louver concentrator are good concentration effect 、 low resistance 、 mezzo air distribution .

研究表明，该浓缩器具有浓缩效果好，阻力低，气流分配适中等优点。

The results showed that the shear strength and impact strength were superior to those of pure resin , and the hardness was mezzo .

结果表明，桐油改性酚醛树脂的剪切强度、冲击强度较未改性树脂大，硬度适中。

and the difficulty is mezzo .

难度水平适中的阅读材料。