Free Mp3 Ringtones

[defgf24uw]

Gansu build the largest coal chemical project - 60 million t of coal methanol


Chemical experiments, such as common for filtration device (Figure 3) should alert students to the following: (1) can not be directly heated (bottle wall thickness due to filtration, heating break down); (2) filter paper slightly smaller than the Brinell diameter of the funnel (to prevent filtrate from the filter branch Lou H § 0 standard ground (connected condenser) liquid storage tube links the piston standard ground paper and funnel the edge leakage, filtering incomplete); (3) first exhaust after filtering. After filtration, the first exhaust pipe and filtration bottle separate connections, then turn off suction pump (first filter paper and funnel the exhaust can be close contact to prevent leakage from the gap; the end of the first separate the exhaust pipe connection with the filtration bottle pumping the filtrate down to prevent smoking); (4) bottom bevel Büchner funnel filtration bottle is drawn to the filter tip (to prevent inhalation of pumping the filtrate directly to the security or the filtration pump bottle). FeSNaSO, NaOH Figure l water steaming a reflux apparatus Figure 2SO: and H: S reactor Figure 3 filtration device on the other hand,[link widoczny dla zalogowanych], in the standard operation procedures of the premise, based on flexible principles of operation to improve operational procedures to optimize the operation . For example: In the preparation of concentrated sulfuric acid and ethanol, ethylene normal operation of the experiment are to be filled with a mixture of rapidly warming to the direct heating tube l70 ℃, but in fact when the temperature rose to l40 ℃ inevitably generated when the ether. If you change the heating operation, use heating oil bath, the first oil bath heated to l70 ℃. Then the mixture into the oil bath tube, and to maintain constant temperature, reducing the chance of ether by-products generated, and also control the carbonization of ethanol, the same black reactants. 4 attention to job design in order to reduce the academic burden on students, should pay attention to job design. It should be noted in the experimental teaching students to play the main role,[link widoczny dla zalogowanych], to promote students based on experimental teaching principles and examples of the instructor to one or a few experimental re-design and improvement. Through job design, the students all brains, all hands, with the students, ears, hands, mouth changed frequently, and chemical experiments observing capabilities, improved analysis, lectures and concentrate on the experiment, data access after-school initiative more people. Willing to ask questions to the teacher more people,[link widoczny dla zalogowanych], the enthusiasm of the students are fully mobilized. Overall quality improved significantly. 5 Conclusion By Principle bridge connects the well of knowledge and ability, theory and practice, skills and quality aspects. Il experimental teaching force in the strong guidance of the principle experiment. Not only enables students to acquire a certain knowledge point, knowledge chain, knowledge network,[link widoczny dla zalogowanych], a deep understanding of a particular experiment, but also in the mastery of knowledge at the same time learn to analyze and solve problems, and skillfully applied to solve practical problems and going,[link widoczny dla zalogowanych], very good to develop students thinking skills, ability, innovation and integrated use of knowledge to solve practical problems.
More articles related to topics：


[link widoczny dla zalogowanych]

ugg boots EAF dust pellet reduction of non-isother

mbt shoes cheap Equivalent to the basic mechanism