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  1. ...you smell any gas or suspect of a leak, you must 1) turn off the gas meter control valve immediately. 2) extinguish any naked flames nearby. 3) open windows and...

    分類:科學及數學 > 化學 2007年02月14日

  2. ...a metal case with a sealing plate equipped with a self-sealing safety valve . The positive and negative electrode plates, isolated from each other...

  3. ... system/no breach 2012-09-10 14:58:04 補充: for 1, is there really a safety problem? MAYBE: harmful volatile reactants and products may leak as gas and then inhaled for 2, if valve settings are improper, pressure may built up insude the system and...

    分類:科學及數學 > 化學 2012年09月14日

  4. ... on the side of the bunsen burner -- not to be confused with the needle valve for gas flow adjustment). 1. air hole closed ( Safety flame) 2. air hole half open 3. air hole nearly fully open 4. air hole fully open (...

    分類:科學及數學 > 化學 2007年12月20日

  5. The first sentence of the text has already given you the answer. 'Water boils at around 100。C under normal air pressure'

  6. The answers can easily be found from the text. 1. Try to find the answer in the first paragraph. 2. Try to find the answer in the third paragraph. 2008-08-17 14:37:29 補充: I think this is a test of English more than a test of...

  7. 1. Water boils at 100 degrees Celsius under normal air pressure. 2. The steam carries the heat away. Hence, the temperature of the boiling water still stays at 100 degrees Celsius. 3. since boiling point of water...

  8. ... of the lighter which are in close proximity to the valve . Safety : As matches, lighters, and other heat sources ...

    分類:科學及數學 > 化學 2008年10月03日

  9. ... (holes on the side of the bunsen burner -- not to beconfused with the needle valve for gas flow adjustment). 1. air baffleclosed ( Safety flame) 2. air baffle half open 3. air baffle nearlyfully open 4. air baffle fully open. 1...

    分類:科學及數學 > 化學 2010年07月26日

  10. ... on the side of the bunsen burner -- not to be confused with the needle valve for gas flow adjustment). 1. air baffle closed ( Safety flame) 2. air baffle half open 3. air baffle nearly fully open 4. air baffle fully open

    分類:科學及數學 > 化學 2011年10月30日