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作者描写了氧和空气混合时适当流速的一种简单而准确的方法。这种方法称之为十字交叉法,可按下列方式快速完成(图1): 简单地画两条竖线,在左侧竖线顶端写上两种气体中含氧最高的百分比,在中间填上要配制的氧的百分比。在图中,我们想把100%的氧和房子里的空气(为方便计算,设空气的含氧量为20%)混合成40%的气体。按各自的位置填好数字后,用较大的数字通过斜交叉减去较小的数字。即40减去20等于20,且填入右上角,100减去40等于60,填入右下角,所得的两个数字分别代表原两种气体的流速,从而达到40%的
The author describes a simple and accurate method for the proper flow of oxygen and air when mixed. This method, known as the criss-cross method, can be done quickly (Figure 1) by simply drawing two vertical bars and writing the highest percentage of oxygen in the two gases at the top of the left vertical bar, The percentage of oxygen to be formulated. In the picture, we want to mix 100% of the oxygen with the air in the house (20% for air, for convenience) into 40% of the gas. After filling in the numbers according to their respective locations, subtract the smaller numbers from the larger numbers by diagonal crosses. 40 minus 20 is equal to 20, and fill in the upper right corner, 100 minus 40 is equal to 60, fill in the lower right corner, the resulting two figures represent the flow of the original two gases, so as to reach 40%