The utility model comprises an air drum, a setting scale for air inflow, a positive negative pressure gauge, a respiration valve and a face mask;

本实用新型有一个气鼓，一个进气量设定标尺，一个正负压力表，一个呼吸活瓣，一个面罩；

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Method: Using positive negative blood grouping to detect ABO blood group, and investigating family heredity, birth order, birth month, compared with normal subjects.

方法：用临床常规的正反定型法检测abo血型，然后调查家族遗传史，胎次和出生月份，并与正常人进行比较。

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The iteration of geometric programming with constraint positive negative term equations is applied to the optimal design for bolted tight connections used in pressure vessels.

对压力容器的螺柱组紧联接的优化设计，采用了约束正负定式几何规划迭代法。

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But for the most part, she says negative developments far outweigh the positive ones.

VOA: standard.2009.09.16

So, when we get really close together, granted, there is a net positive negative charge with a Coulombic force of attraction.

当它们真正离得很近时，假设有一个带正负电的电荷,带有库仑引力。

麻省理工公开课 - 固态化学导论课程节选

No, we call that work positive work. All right, so that means we need to put a negative sign right here, by convention.

历史上有过不同的习惯，这里我们规定,如果环境对系统做功。

麻省理工公开课 - 热力学与动力学课程节选

The new normal is more of the same: a mixed bag of positive and negative news and data, with the negative outweighing the positive on balance.

FORBES: For Businesses, A Misty-Eyed View Of Economy As Sentiment Worsens

When the public was asked to choose between a simple positive and negative assessment, however, it split down the middle: 51% said unions had a negative impact, while 49% said their effect was positive.

WSJ: Peterson, Howell and West: Teachers Unions Have a Popularity Problem

Twitter sentiment is about 3:1 positive to negative, for James Bond and more than 4:1 positive for Skyfall, a small suggestion that this is a very well liked version in the franchise.

FORBES: Move up http://i.forbesimg.com t Move down