A、B部位横裂纹时更换，其他部位上平面、侧面横裂纹长度不大于裂纹处断面周长的20%，底面横裂纹长度不大于底面宽度的20%时焊修（测量周长或宽度时，铸孔计算在内，测量裂纹长度时，铸孔不计算在内），焊波须高于基准面1mm～2mm，焊修后进行热处理；大于时更换。
So could it be that Earth really is unique? All living things on Earth are made of the same building blocks, long carbon-based molecules.所以地球真的是独一无二的吗？地球上所有的生物都有着相同的组成成分，即长碳基分子。Scientists now think that a large proportion of these molecules came from...
Molecules are held together by one of two types of bonds – covalent bonds or ionic bonds. A covalent bond is a chemical bond that involves the sharing of electron pairs between atoms. And the bond they form, which is the result of a stable balance of attractive and repulsive forces betwee...
Japanese researchers traced the odor to a chemical compound (化合物) called 2-nonenal. The compound is a byproduct of other chemical breakdowns and sends out a “greasy” or “grassy” odor as the molecules (分子) exit...
Separation of gases by fractional distillation isn't the only way to generate oxygen or nitrogen from air. A membrane generator uses a system of semipermeable, hollow-fiber membranes that allow smaller molecules in a sample of compressed air to pass while blocking the larger ones. This type of...
我们在养花时，会经常给花浇水、施肥、松土，将花放在太阳下。天气冷了，我们还要把花放在屋里，而且一般一个花盆栽一株植物，这体现了生物生存所需的基本条件。与上述顺序相对应的条件依次是( )①营养物质②空气③阳光④适宜的温度⑤一定的生存空间⑥水 ...
the respiratory system consists of the airways the lungs and the respiratory muscles that mediate the movement of air into and out of the body. Within the alveolar system of the lungs molecules of oxygen and carbon dioxide are passively exchanged by diffusion beeen the gaseous ...
On Earth our daytime sky is bright and blue, That’s because water droplets, dust particles, and molecules in the air are lighted by the sun. 在地球上,白天时候的天空是明亮的蓝色。那是因为空气中的小水滴,粉尘颗粒和小分子使太阳...
Have you ever seen a flower change color or noticed how food changes when cooked? These are all examples of chemical reactions that occur due to changes in the arrangement of atoms and molecules. Pharmaceuticals Chemistry plays a crucial role in the development of new medicines. Pharmaceutical com...
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