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It is generally accepted that smoking is harmful to our health.

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In the research of prescription, through the experiments we knew the influence from the Nb_2O_5 or Y_2O_3 single donor doped on high-temperature PTC ceramic, and got the curve graph drawing the resistivity and mixing quantity. In order to restrain lead volatilize and mix the rang of donors to neutralization the harmful acceptor impurity in raw materials, adopt the prescription design of Nb_2O_5 and Y_2O_3 double donors-doped. From the result, we know that regulation proportion of Nb , Y double donors, can make high-temperature PTC ceramics semiconducting, the pottery demonstrates good electric performance.

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The product poses a chemical risk because of the presence of acetophenone, a substance classified by Directive 67/548/EEC as harmful if swallowed and irritating to eyes.

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The main danger and harmful factors existing during the production of acetylene were introduced.

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Kimchi has antibiotic functions as lactic acid bacteria produced in the process of fermentation suppresses growth of harmful bacteria.

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But do not eat together with acrimony content, the kidney that has pair of people more is harmful.

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Adenine, which is common and essential to creatures, is widely used in clinical field. However,abundance of adenine is harmful to the living body.

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The result of testing on agricultural four-wheel tractors shows that the chassis makes it possible for miniature agrimotor to be unmanned, and this technique may be extensively used for agricultural work can effectively protect operators under harmful env...

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